function showHideLayers(firstLayer, secondLayer, thirdLayer, changeClass) {
	var L1 = document.getElementById(firstLayer);
	var L2 = document.getElementById(secondLayer);
	var L3 = document.getElementById(thirdLayer);

	if (L1.style.display == 'none')
	{
		L1.style.display = 'block';
		L2.style.display = 'none';
		L3.className = changeClass;
	}

	createCookie(thirdLayer, firstLayer);	
}

function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else
		var expires = "";

	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');

	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}

	return null;
}

function pageLoad()
{
	checkCookies();
	pngFix();
}

function checkCookies()
{
	var activeTab1 = readCookie('home_container01_parent_tabs');
	var activeTab2 = readCookie('home_container02_parent_tabs');

	if (activeTab1)
	{
		var inactiveTab1 = (activeTab1 == 'home_container01a') ? 'home_container01b' : 'home_container01a';
		var parentTabClass1 = (activeTab1 == 'home_container01a') ? 'tab1' : 'tab2';
		showHideLayers(activeTab1, inactiveTab1, 'home_container01_parent_tabs', parentTabClass1);
	}

	if (activeTab2)
	{
		var inactiveTab2 = (activeTab2 == 'home_container02a') ? 'home_container02b' : 'home_container02a';
		var parentTabClass2 = (activeTab2 == 'home_container02a') ? 'tab3' : 'tab4';
		showHideLayers(activeTab2, inactiveTab2, 'home_container02_parent_tabs', parentTabClass2);
	}
}

function pngFix()
{
	var arVersion = navigator.appVersion.split("MSIE")
	var version = parseFloat(arVersion[1])

	if ((version >= 5.5 && version < 7) && (document.body.filters)) 
	{
		for(var i=0; i<document.images.length; i++)
		{
			var img = document.images[i]
			var imgName = img.src.toUpperCase()
			if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
			{
				var imgID = (img.id) ? "id='" + img.id + "' " : ""
				var imgClass = (img.className) ? "class='" + img.className + "' " : ""
				var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
				var imgStyle = "display:inline-block;" + img.style.cssText 
				if (img.align == "left") imgStyle = "float:left;" + imgStyle
				if (img.align == "right") imgStyle = "float:right;" + imgStyle
				if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
				var strNewHTML = "<span " + imgID + imgClass + imgTitle
				+ " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
				+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
				+ "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
				img.outerHTML = strNewHTML
				i = i-1
			}
		}
	}
}