var w ;
function lunch(url,name,width,height)
{

    w = window.open(url,name
    ,"left=" + (screen.width-width)/2 + ",top=" + (screen.height-height)/2 + ",height=" + (height) + ",width=" + (width) 
    + ",status=yes,toolbar=no,menubar=no,location=no,resizable=yes,scrollbars=no",null);
    w.focus();
    
}