function fnSwap(obj) {
	var strSrc = obj.src + "";
	var strBaseSrc = strSrc.substring(0,strSrc.lastIndexOf("."));
	var strExtension = strSrc.substring(strSrc.lastIndexOf("."),strSrc.length);
	if (strBaseSrc.lastIndexOf("On") == (strBaseSrc.length - 2)) {
		obj.src = strBaseSrc.substring(0,strSrc.lastIndexOf("On")) + strExtension;
	} else {
		obj.src = strBaseSrc + "On" + strExtension;
	}
}