function onRollOver(img_obj){
	img_obj.src = img_obj.src.split("-off").join("-on");
}

function onRollOut(img_obj){
	img_obj.src = img_obj.src.split("-on").join("-off");	
}  

// onMouseOver="onRollOver(this);" onMouseOut="onRollOut(this)" 

function e(id){
	return document.getElementById(id);
}