function preloadMainImages() {
if (document.images)
	{
	var btn_strategies_roll = new Image
		btn_strategies_roll.src = "images/btn_strategies_over.gif"
	var btn_tellafriend_roll = new Image
		btn_tellafriend_roll.src = "images/btn_tellafriend_over.gif"
	var btn_otherresources_roll = new Image
		btn_otherresources_roll.src = "images/btn_otherresources_over.gif"
	var btn_standards_roll = new Image
		btn_standards_roll.src = "images/btn_standards_over.gif"
	var btn_discussionforum_roll = new Image
		btn_discussionforum_roll.src = "images/btn_discussionforum_over.gif"
	var btn_designclassroom_roll = new Image
		btn_designclassroom_roll.src = "images/btn_designclassroom_over.gif"
	var btn_visualizing_roll = new Image
		btn_visualizing_roll.src = "images/btn_visualizing_over.gif"
	var btn_priorknowledge_roll = new Image
		btn_priorknowledge_roll.src = "images/btn_priorknowledge_over.gif"
	var btn_makingconnections_roll = new Image
		btn_makingconnections_roll.src = "images/btn_makingconnections_over.gif"
	var btn_questioning_roll = new Image
		btn_questioning_roll.src = "images/btn_questioning_over.gif"
	var btn_inferring_roll = new Image
		btn_inferring_roll.src = "images/btn_inferring_over.gif"
	var btn_summarizing_roll = new Image
		btn_summarizing_roll.src = "images/btn_summarizing_over.gif"
	var btn_evaluating_roll = new Image
		btn_evaluating_roll.src = "images/btn_evaluating_over.gif"
	var btn_synthesizing_roll = new Image
		btn_synthesizing_roll.src = "images/btn_synthesizing_over.gif"
	var btn_usingstrategies_roll = new Image
		btn_usingstrategies_roll.src = "images/btn_usingstrategies_over.gif"
	var btn_studentarea_roll = new Image
		btn_studentarea_roll.src = "images/btn_studentarea_over.gif"
	var btn_teacherarea_roll = new Image
		btn_teacherarea_roll.src = "images/btn_teacherarea_over.gif"
	var btn_aboutproject_roll = new Image
		btn_aboutproject_roll.src = "images/btn_aboutproject_over.gif"
	var btn_credits_roll = new Image
		btn_credits_roll.src = "images/btn_credits_over.gif"
	var btn_bibliography_roll = new Image
		btn_bibliography_roll.src = "images/btn_bibliography_over.gif"
	var btn_contactus_roll = new Image
		btn_contactus_roll.src = "images/btn_contactus_over.gif"
	}
}

function changeImages(sName,sImage)
	{
	if (document.images)
		{
		document.images[sName].src = sImage
		}
	}

function openWindow(theURL,winName,features)
	{
	window.open(theURL,winName,features).focus();
	}

function closeWindow()
	{
	window.close();
	}

if (document.layers)
	{
	origWidth = innerWidth;
	origHeight = innerHeight;
	}
function reloadPage()
	{
	if (innerWidth != origWidth || innerHeight != origHeight)
	location.reload();
	}
if (document.layers)
	onresize=reloadPage;
	
function goHistory()
	{
	window.history.go(-1);
	}
	
function getFlashVideo(num)
	{
	//window.document.video_container.SetVariable("currVideo", num);
	setFlashVariables('video_container','currVideo='+num);
	}
	
function getCurrDate()
	{
	currDate=new Date();
	currYear = currDate.getFullYear();
	if (currYear<2000)
		{
		currYear+=1900;
		}
	}