function pop(w,h,t,l,url, winName) {
        var sWid = screen.width;
        var sHi = screen.height;
        var wid = w;
        var hi = h;
        if ((t == 0) && (l == 0)) {
                var tp = (sHi/2)-(hi/2);
                var lft = (sWid/2)-(wid/2);
        } else {
                var tp = t;
                var lft = l;    
        }
            if (scroll && document.all && (navigator.userAgent.indexOf("Mac") > -1)) wid = wid+17;
        newwin=window.open(url,winName,"WIDTH=" + wid + ",HEIGHT=" + hi + ",scrollBars=yes,toolbar=yes,status=no,resizable=no, top = "+ tp +", left ="+ lft + ", screenX=" + lft +", screenY= "+tp);
        newwin.focus();
}