function popitup(url, h1, w1)
{

    var change_window = '';
    var h = h1;
    var w = w1;
    
    if (!change_window.closed && change_window.location)
    {
        change_window.location.href = url; 
    }
    else
    {
        change_window=window.open(url,'name','height='+h+', width='+w+', center');
        change_window.moveTo(screen.availHeight/2-(h/2),screen.availWidth/2-(w/2));
        if (!change_window.opener) change_window.opener = self; 
    }
    if (window.focus) {change_window.focus()}
    //return false;
}