var bName = navigator.appName;
var bVer = parseInt(navigator.appVersion);

function openSites(url) {

if ((bName == "Netscape" && bVer >= 3) || (bName == "Microsoft Internet Explorer" && bVer >= 3)) {
 
	siteswin = window.top.open("","sites","height=400,width=410,scrollbars=yes,toolbar=no,location=no,resize=no");
	siteswin.location.href=url;
	if ( siteswin.opener == null ) siteswin.opener = window.top;
	if (!(bName == "Microsoft Internet Explorer" && bVer == 3)) siteswin.focus();
	}

}