var logWin;
function popUp(url,name,w,h,extra){
	str="height="+h+",width="+w+","+extra;
	if(parseInt(navigator.appVersion)>3) {
		str+=",left="+(screen.width-w)/2+",top="+parseInt((screen.height -h)/2);
		logWin=window.open(url,name,str);
		logWin.focus();
	}
}