nn4 = (document.layers)? true : false;
		ie4 = (document.all)? true : false;
		dom = (document.getElementById)? true : false;
		
		function win(fileToOpen, winName, winWidth, winHeight) {
		if (nn4 || ie4 || dom) {
		posX = Math.round(screen.width/2 - 250);
		posY = 10;
		posCode = (nn4)? "screenX="+posX+",screenY="+posY : "left="+posX+",top="+posY;
		} else { posCode = ""; }
		gWindow = window.open(fileToOpen,winName,"menubar=no,toolbar=no,scrollbars=no,status=no,width="+winWidth+",height="+winHeight+","+posCode);
		gWindow.focus();
		return false;
		}
		
		var image_null = new Image(10, 10);
		image_null.src="/Images/null.gif";
		
		try {  document.execCommand('BackgroundImageCache', false, true);} catch(e) {}