function open_window(url,w,h) {
         var w = w + 20;
         var h = h + 30;
         zoom=window.open(url,"window",'width='+w+',height='+h+',scrollbars=yes,menubar=no');
         //var x = (screen.width-w)/2;
         //zoom.moveTo(x,30);
         zoom.focus();
}