var newwindow;
function popup(w,h,p){
var left = (screen.availWidth/2) - (w/2);
var top = (screen.availHeight/2) - (h/2);
newwindow=window.open(p,'Insert','width='+w+',height='+h+',s crollbars=0,status=0, left='+left+', top='+top)
if (window.focus) {newwindow.focus()}
}