window.onload=init;
function init() {
	var url = document.URL;
	//extract filename without trailing digits or extension
	page = url.match(/.*[\\\/]([^\d]+)\d*\./);
	page = page[1];
	Over(page);
}
function Over(id) {
	var over = "/k12/img/" + id + "_w.jpg";
	var image = document.getElementById(id);
	image.src=over;
}
function Out(id) {
	if (id != page) {
		var out = "/k12/img/" + id + "_y.jpg";
		var image = document.getElementById(id);
		image.src=out;
	}
}