function winOpen(url, name, w, h) {
var H = screen.width/2 -(w/2);
var V = screen.height/2 -(h/2);
window.open(url,name,'width='+w+',height='+h+',scrollbars=0,resizable=0,menubar=0,toolbar=0,status=0,location=0,directories=0,left='+H+',top='+V+'');
}