//	object detection stuff
//	establish global variable flags for element reference categories
var isW3C = (document.getElementById) ? true : false;
var isAll = (document.all) ? true : false;

//	take the ID of an HTML element and returns an object reference
function getObj(elemID) {
	var theObj  = (isAll) ? document.all[elemID] : ((isW3C) ? document.getElementById(elemID) : null);
	return theObj;
}

//generic swap image script
function swapImage(id,uri) {
	getObj(id).src = uri;
}