userAg = window.navigator.userAgent;
bVer = parseInt(userAg.charAt(userAg.indexOf("/")+1),10);

function IsIE() {
 return userAg.indexOf("MSIE") > 0;
}

function setImg(name, url) {
	var img = null;
	if (document.images) {
		if (!IsIE()) img = getItem(name, 0);
		else img = document.images[name];
		if (img) img.src = url;
	}
}

function getItem(n, ly) {
 if (bVer < 4) return document[n];
 var curDoc = ly ? ly.document : document;
 var elem = curDoc[n];
 if (!elem) {
	for (var i=0;i<curDoc.layers.length;i++) {
		elem = getItem(n,curDoc.layers[i]);
		if (elem) return elem;
	}
 }
 return elem;
}