<!--- 
if (document.images) {

	var header1 = new Image();
	header1.src = "images/overview.gif";
	var header1on = new Image();
	header1on.src = "images/overview_on.gif";
	
	var header2 = new Image();
	header2.src = "images/resources.gif";
	var header2on = new Image();
	header2on.src = "images/resources_on.gif";
	
	var header3 = new Image();
	header3.src = "images/testimonials.gif";
	var header3on = new Image();
	header3on.src = "images/testimonials_on.gif";
	
	var header4 = new Image();
	header4.src = "images/learning.gif";
	var header4on = new Image();
	header4on.src = "images/learning_on.gif";

}

function headeron(name) {
 if (document.images){
	document[name].src = eval(name + "on.src");}
}

function headeroff(name) {
 if (document.images){
	document[name].src = eval(name + ".src");}
}
//--->