// Allows multiple functions to load

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}


// Clears & validates forms

function resetFields(whichform) {
/*  for (var i=0; i<whichform.elements.length; i++) {
    var element = whichform.elements[i];
    if (element.type == "submit") continue;
    if (!element.defaultValue) continue;
	if (element.className.indexOf("email") == -1) continue;
    element.onfocus = function() {
    if (this.value == "enter e-mail here") {
      this.value = "";
     }
    }
    element.onblur = function() {
      if (this.value == "") {
        this.value = "enter e-mail here";
      }
    }
  } */
}

function validateForm(whichform) {
  for (var i=0; i<whichform.elements.length; i++) {
    var element = whichform.elements[i];
    if (element.className.indexOf("requ") != -1) {
      if (!isFilled(element)) {
        alert("Please complete all required fields");
        return false;
      }
    }
    if (element.className.indexOf("reqmail") != -1) {
      if (!isFilled(element))  {
        alert("Please enter your e-mail");
        return false;
      }
      if (!isEmail(element)) {
        alert("Please enter your e-mail again - it doesn\'t appear to be correct \n(If the problem persists please e-mail us directly at webmaster@cgmnh.org)");
        return false;
      }
    }
    if (element.className.indexOf("reqfrmail") != -1) {
      if (!isEmail(element)) {
        alert("Please enter your friend\'s e-mail again - it doesn\'t appear to be valid \n(if the problem persists please e-mail us directly at webmaster@cgmnh.org)");
        return false;
      }
    }
    if (element.className.indexOf("email") != -1) {
      if (!isEmail(element)) {
        alert("Please enter your e-mail again - it doesn\'t appear to be valid \n(If the problem persists please e-mail us directly at webmaster@cgmnh.org)");
        return false;
      }
    }
  }
  return true;
}

function isFilled(field) {
  if (field.value.length < 1 || field.value == field.defaultValue) {
    return false;
  } else {
    return true;
  }
}

function isEmail(field)
{
    // you could add a test to see if the brower support regular expression or not here
    if (RegExp) {
        return checkEmail(field.value);
    } else {
      if (field.value.indexOf("@") == -1 || field.value.indexOf(".") == -1) {
        return false;
      } else {
        return true;
      }
   }
}

function checkEmail(addr)
{
    var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,9}(?:\.[a-z]{2})?)$/i
    return filter.test(addr);
}

function prepareForms() {
  for (var i=0; i<document.forms.length; i++) {
    var thisform = document.forms[i];
    resetFields(thisform);
    thisform.onsubmit = function() {
      return validateForm(this);
    }
  }
}


// Opens PDF links in new windows
/*
function doPopups()
{
 if (!document.getElementsByTagName) return false;
 var links = document.getElementsByTagName("a");
 for (var i=0; i < links.length; i++) {
  if (links[i].href.indexOf('.pdf') !== -1) {
   links[i].onclick =
    function() {
     window.open(this.href,'popper','resizable,scrollbars');
     return false;
    }
    links[i].title += "\n(opens in a new window)";
    var img = document.createElement("img");
    img.setAttribute("src", "/images/new-win-icon.gif");
    img.setAttribute("alt", "(opens in a new window)");
    links[i].appendChild(img);
  }
 }
}
*/

// Opens virtual tour in new window

function doVirtual() {
 if (!document.getElementsByTagName) return false;
 var links = document.getElementsByTagName("a");
 for (var i=0; i < links.length; i++) {
  if (links[i].className.match('virtual')) {
   links[i].onclick =
    function() {
     window.open(this.href,'popper','width=390,height=560,resizable,scrollbars');
     return false;
    }
    links[i].title = "(opens in a new window - may take up to two minutes to download on a dial-up modem)";
    var img = document.createElement("img");
    img.setAttribute("src", "/images/new-win-icon.gif");
    img.setAttribute("alt", "(opens in a new window)");
    links[i].appendChild(img);
  }
 }
}


// Opens tell a friend in new window

function doTellFriend() {
 if (!document.getElementsByTagName) return false;
 var links = document.getElementsByTagName("a");
 for (var i=0; i < links.length; i++) {
  if (links[i].className.match('friend')) {
   links[i].onclick =
    function() {
     window.open(this.href,'popper','width=410,height=540,resizable,scrollbars');
     return false;
    }
    links[i].title += "(opens in a new window)";
    var img = document.createElement("img");
    img.setAttribute("src", "/images/new-win-icon.gif");
    img.setAttribute("alt", "(opens in a new window)");
    links[i].appendChild(img);
  }
 }
}


// Cancel links with # in them

function cancelLink() {
 if (!document.getElementsByTagName) return false;
 var links = document.getElementsByTagName("a");
 for (var i=0; i < links.length; i++) {
  if (links[i].href.match(/#$/)) {
   links[i].onclick =
    function() {
     return false;
    }
  }
 }
}


// Puts rounded corners on to menu items
/*
function roundedCorners() {
  if (!document.getElementsByTagName) return false;
  var divs = document.getElementsByTagName('div');
  var rounded_divs = [];
  for (var i = 0; i < divs.length; i++) {
    if (/\bbox\b/.exec(divs[i].className)) {
      rounded_divs[rounded_divs.length] = divs[i];
    }
  }
  for (var i = 0; i < rounded_divs.length; i++) {
    var original = rounded_divs[i];
    original.className = original.className.replace('box', '');
    var div2 = document.createElement('div');
    div2.className = 'box2';
    original.parentNode.replaceChild(div2, original);
    for (var ii = 3; ii < 9; ++ii) {
        eval("var div" + ii + " = document.createElement('div');");
    }
    for (var iii = 2; iii < 8; ++iii) {
        eval("div" + iii + ".appendChild(div" + (iii + 1) + ");");
    }
    div8.appendChild(original);
  }
}
*/

// Turns e-mail addresses into mailtos

function changeMail() {
 if (!document.getElementsByTagName) return false;
 var span = document.getElementsByTagName("span");
 for (var i=0; i < span.length; i++) {
  if (span[i].className.match('email')) {
   var innerspan = span[i].getElementsByTagName("span")[0].firstChild.nodeValue;
   span[i].innerHTML = "<a href='mailto:"+innerspan+"@cgmnh.org'>"+innerspan+"@cgmnh.org"
  }
 }
}


// Stylesheet switcher

function getAllSheets() {
	if( !window.ScriptEngine && navigator.__ice_version ) {
        return document.styleSheets;
    }
	if( document.getElementsByTagName ) {
        var Lt = document.getElementsByTagName('link'), St = document.getElementsByTagName('style');
	} else if(
        document.styleSheets && document.all ) { var Lt = document.all.tags('LINK'), St = document.all.tags('STYLE');
	} else { return []; } for( var x = 0, os = []; Lt[x]; x++ ) {
		var rel = Lt[x].rel ? Lt[x].rel : Lt[x].getAttribute ? Lt[x].getAttribute('rel') : '';
		if( typeof( rel ) == 'string' && rel.toLowerCase().indexOf('style') + 1 ) { os[os.length] = Lt[x]; }
	}
    for(var x = 0; St[x]; x++ ) {
        os[os.length] = St[x];
    }
    return os;
}
function changeStyle() {
	window.userHasChosen = window.MWJss;
	for( var x = 0, ss = getAllSheets(); ss[x]; x++ ) {
		if( ss[x].title ) { ss[x].disabled = true; }
		for( var y = 0; y < arguments.length; y++ ) { if( ss[x].title == arguments[y] ) { ss[x].disabled = false; } }
} 
	backToRegularView()
}
function rememberStyle( cookieName, cookieLife ) {
	for( var viewUsed = false, ss = getAllSheets(), x = 0; window.MWJss && ss[x]; x++ ) {
        if( ss[x].disabled != MWJss[x] ) {
            viewUsed = true;
            break;
        }
    }
	if( !window.userHasChosen && !viewUsed ) {
        return;
    }
	for( var x = 0, outLine = '', doneYet = []; ss[x]; x++ ) {
		if( ss[x].title && ss[x].disabled == false && !doneYet[ss[x].title] ) {
            doneYet[ss[x].title] = true;
            outLine += ( outLine ? ' MWJ ' : '' ) + escape( ss[x].title );
        }
    }
	if( ss.length ) {
	
        document.cookie = escape( cookieName ) + '=' + escape( outLine ) + ( cookieLife ? ';expires=' + new Date( ( new Date() ).getTime() + ( cookieLife * 86400000 ) ).toGMTString() : '' ) + ';path=/';
    }
}
function useStyleAgain( cookieName ) {
	
	for( var x = 0; x < document.cookie.split( "; " ).length; x++ ) {
		
		var oneCookie = document.cookie.split( "; " )[x].split( "=" );
		if( oneCookie[0] == escape( cookieName ) ) {
			var styleStrings = unescape( oneCookie[1] ).split( " MWJ " );
			for( var y = 0, funcStr = ''; styleStrings[y]; y++ ) { funcStr += ( y ? ',' : '' ) + 'unescape( styleStrings[' + y + '] )'; }
			eval( 'changeStyle(' + funcStr + ');' );
            break;
	   }
    }
    window.MWJss = []; for( var ss = getAllSheets(), x = 0; ss[x]; x++ ) {
        MWJss[x] = ss[x].disabled;
    }
}

window.onload = function(e) {
    useStyleAgain('styleTestStore');
}
window.onunload = function(e) {
    rememberStyle('styleTestStore',10);
}


function fontDisplay() {

  if (navigator.appName == 'Microsoft Internet Explorer' && navigator.platform == 'MacPPC' || !document.getElementById || !document.getElementById("fontch")) return false;

  var div = document.createElement("div");
  var h2 = document.createElement("h2");
  h2.appendChild(document.createTextNode("Font size"));
  var ulist = document.createElement("ul");
  ulist.setAttribute("id","fonts");

  var listitem1 = document.createElement("li");
  var ahref1 = document.createElement("a");
  var off1 = document.createElement("span");

  listitem1.setAttribute("class", "sma");
  listitem1.setAttribute("className", "sma");
  ahref1.setAttribute("href","#");
  off1.setAttribute("class", "off");
  off1.setAttribute("className", "off");

  off1.appendChild(document.createTextNode("Regular font size "));
  ahref1.appendChild(off1);
  ahref1.appendChild(document.createTextNode("A"));
  listitem1.appendChild(ahref1);


  var listitem2 = document.createElement("li");
  var ahref2 = document.createElement("a");
  var off2 = document.createElement("span");

  listitem2.setAttribute("class", "med");
  listitem2.setAttribute("className", "med");
  ahref2.setAttribute("href","#");
  off2.setAttribute("class", "off");
  off2.setAttribute("className", "off");

  off2.appendChild(document.createTextNode("Medium font size "));
  ahref2.appendChild(off2);
  ahref2.appendChild(document.createTextNode("A"));
  listitem2.appendChild(ahref2);


  var listitem3 = document.createElement("li");
  var ahref3 = document.createElement("a");
  var off3 = document.createElement("span");

  listitem3.setAttribute("class", "lar");
  listitem3.setAttribute("className", "lar");
  ahref3.setAttribute("href","#");
  off3.setAttribute("class", "off");
  off3.setAttribute("className", "off");

  off3.appendChild(document.createTextNode("Large font size "));
  ahref3.appendChild(off3);
  ahref3.appendChild(document.createTextNode("A"));
  listitem3.appendChild(ahref3);


  ulist.appendChild(listitem1);
  ulist.appendChild(listitem2);
  ulist.appendChild(listitem3);

  var fontch = document.getElementById("fontch");
  div.appendChild(h2);
  div.appendChild(ulist);
  fontch.appendChild(div);

  var para = document.createElement("p");
  var viewopts = document.createElement("a");
  viewopts.setAttribute("href","/viewopts.shtml");
  viewopts.appendChild(document.createTextNode("More viewing options"));
  para.appendChild(viewopts);
  fontch.appendChild(para);

  ahref1.onclick = function () {changeStyle(''); return false}
  ahref2.onclick = function () {changeStyle('med'); return false}
  ahref3.onclick = function () {changeStyle('lar'); return false}

  ahref1.onmouseover = function () {window.status=''; return true}
  ahref2.onmouseover = function () {window.status=''; return true}
  ahref3.onmouseover = function () {window.status=''; return true}
}

function backToRegularView()
{
	var eleForm;
	var eleDiv;
	var eleInput;
		
	if(document.getElementById("returnnormalview"))
	{
		eleRemove = document.getElementById("returnnormalview");
		document.body.removeChild(eleRemove)
	}
	
	for( var x = 0, ss = getAllSheets(); ss[x]; x++ ) 
	{
		
		if (ss[x].rel == "alternate stylesheet")
		{
			// alert(ss[x].title + ":" + ss[x].disabled + ":" +  ss[x].rel);	
			if (ss[x].disabled == false)
			{				
				var eleForm = document.createElement("form");
				var eleInput = document.createElement("input");
				var eleDiv = document.createElement("div");
				
				eleDiv.setAttribute("id", "returnnormalview");
				
				eleForm.setAttribute("action", "#");
				eleForm.setAttribute("class", "regview");
				eleForm.setAttribute("className", "regview");
				
				eleInput.setAttribute("type", "submit");
				eleInput.setAttribute("value", "Back to regular view");
				eleInput.setAttribute("class", "button");
				eleInput.setAttribute("className", "button");
				
				eleForm.appendChild(eleInput);
				eleDiv.appendChild(eleForm);
				document.body.appendChild(eleDiv);
				
				eleDiv = document.getElementById("returnnormalview");
				eleInputs = eleDiv.getElementsByTagName("input");
				eleInputs[0].onclick = function () {changeStyle(''); return false}
			}
		}
	}
}

function changeFont()
{
	if (document.getElementById)
	{
		if (document.getElementById("viewopts"))
		{
  			document.getElementById("sma").onclick = function () {changeStyle('');};
  			document.getElementById("med").onclick = function () {changeStyle('med');};
			document.getElementById("lar").onclick = function () {changeStyle('lar');};
  			document.getElementById("high-con").onclick = function () {changeStyle('high-con');};
			document.getElementById("pda").onclick = function () {changeStyle('pda');};
		}
	}
}

// Link displayer for printing

function footnoteLinks(containerID, targetID)
{
      if (!document.getElementById || !document.getElementsByTagName || !document.createElement) return false;
      if (!document.getElementById(containerID) || !document.getElementById(targetID)) return false;

      var container = document.getElementById(containerID);
      var target    = document.getElementById(targetID);
      var h2        = document.createElement('h2');
      addClass.apply(h2,['printOnly']);

      var h2_txt    = document.createTextNode('Links');
      h2.appendChild(h2_txt);

      var coll = container.getElementsByTagName('*');
      var ol   = document.createElement('ol');
      addClass.apply(ol,['printOnly']);

      var myArr = [];
      var thisLink;
      var num = 1;
      for (var i=0; i< coll.length; i++) {
        var thisClass = coll[i].className;
        if ( (coll[i].getAttribute('href') || coll[i].getAttribute('cite')) && (thisClass == '' || thisClass.indexOf('nop') == -1)) {
          thisLink = coll[i].getAttribute('href') ? coll[i].href : coll[i].cite;
          var note = document.createElement('sup');
          addClass.apply(note,['printOnly']);
          var note_txt;
          var j = inArray.apply(myArr,[thisLink]);
          if ( j || j===0 ) {
            note_txt = document.createTextNode(j+1);
          } else {
            var li     = document.createElement('li');
            var li_txt = document.createTextNode(thisLink);
            li.appendChild(li_txt);
            ol.appendChild(li);
            myArr.push(thisLink);
            note_txt = document.createTextNode(num);
            num++;
          }
          note.appendChild(note_txt);
          if (coll[i].tagName.toLowerCase() == 'blockquote') {
            var lastChild = lastChildContainingText.apply(coll[i]);
            lastChild.appendChild(note);
          } else {
            coll[i].parentNode.insertBefore(note, coll[i].nextSibling);
          }
        }
      }
      target.appendChild(h2);
      target.appendChild(ol);
      addClass.apply(document.getElementsByTagName('html')[0],['noted']);
      return true;
}

 function doFootNoteLinks()
 {
    footnoteLinks('content','content');
 }

   function inArray(needle) {
      for (var i=0; i < this.length; i++) {
        if (this[i] === needle) {
          return i;
        }
      }
      return false;
    }
    function addClass(theClass) {
      if (this.className != '') {
        this.className += ' ' + theClass;
      } else {
        this.className = theClass;
      }
    }
    function lastChildContainingText() {
      var testChild = this.lastChild;
      var contentCntnr = ['p','li','dd'];
      while (testChild.nodeType != 1) {
        testChild = testChild.previousSibling;
      }
      var tag = testChild.tagName.toLowerCase();
      var tagInArr = inArray.apply(contentCntnr, [tag]);
      if (!tagInArr && tagInArr!==0) {
        testChild = lastChildContainingText.apply(testChild);
      }
      return testChild;
    }



addLoadEvent(prepareForms);
/*addLoadEvent(doPopups);*/
addLoadEvent(doVirtual);
addLoadEvent(doTellFriend);
addLoadEvent(cancelLink);
addLoadEvent(fontDisplay);
/*addLoadEvent(roundedCorners);*/
addLoadEvent(changeMail);
addLoadEvent(doFootNoteLinks);
addLoadEvent(changeFont);