if (document.images) {
	var links_on = new Image(); 
	links_on.src = "images/links_on.gif";
	var links_off = new Image(); 
	links_off.src = "images/links_off.gif";

	var activities_on = new Image(); 
	activities_on.src = "images/activities_on.gif";
	var activities_off = new Image(); 
	activities_off.src = "images/activities_off.gif";

	var learnmore_on = new Image(); 
	learnmore_on.src = "images/learnmore_on.gif";
	var learnmore_off = new Image(); 
	learnmore_off.src = "images/learnmore_off.gif";

	var home_on = new Image(); 
	home_on.src = "images/home_on.gif";
	var home_off = new Image(); 
	home_off.src = "images/home_off.gif";

}


function act(imgName) {
	if (document.images) 
		document.images[imgName].src = eval(imgName + "_on.src");
}

function inact(imgName) {
	if (document.images)
		document.images[imgName].src = eval(imgName + "_off.src");
}