var newwin;
function launchwin(winurl,winname,winfeatures){
window.open(winurl,winname,winfeatures);
}

var newwin;
function pop2(winurl,winname,winfeatures,w,h){
var winl = (screen.width - w) / 2;
var wint = (screen.height - h) / 2;
winprops = winfeatures +',top='+wint+',left='+winl
win = window.open(winurl,winname,winprops)
}