function openWindow(pUrl,windowName,width,height,scroll)
{
        x = (640 - width)/2, y = (480 - height)/2;
        if (screen)
        {
                y = (screen.availHeight - height)/2;
                x = (screen.availWidth - width)/2;
        }
        if (screen.availWidth > 1800)
        {
                x = ((screen.availWidth/2) - width)/2;
        }
        if (scroll==null)
        {
            scroll='scrollbars=no';
        }
        else
        {
            scroll='scrollbars=yes';
        }
        window.open(pUrl,windowName,'width='+width+',height='+height+',screenX='+x+',screenY='+y+',top='+y+',left='+x+','+scroll);
}