var sUserAgent = navigator.userAgent.toLowerCase();
var isIE = document.all?true:false;
var isNS4 = document.layers?true:false;
var isOp = (sUserAgent.indexOf('opera')!=-1)?true:false;
var isMoz = (sUserAgent.indexOf('mozilla/5')!=-1 && sUserAgent.indexOf('opera')==-1 && sUserAgent.indexOf('msie')==-1)?true:false;

function pop (oAnchor,sWindow,sProps){
	var sUrl = '';
	if (oAnchor.getAttribute) sUrl = oAnchor.getAttribute ('href');
	if (sUrl=='' && isIE) sUrl = window.event.srcElement.getAttribute ('href');
	if (sUrl=='') sUrl = oAnchor.href;
	var sWindowName = sWindow? sWindow: '_blank';
	if (!sProps) sProps = 'width=640,height=480,scrollbars,resizable,toolbar,status,menubar,location';
	if (sUrl) var oPopup = window.open (sUrl, sWindowName, sProps);
	if (oPopup && !isOp) oPopup.focus ();
	return (oPopup)? false: true;
}