function OpenWindow(address, name, popupWidth, popupHeight, scrollbar)
    {
        x = document.body.clientWidth/2 - popupWidth/2;
        y = document.body.clientHeight/2 - popupHeight/2;
        
        popupWindow = window.open(address,name,'width='+popupWidth+', height='+popupHeight+', top='+ y +', left='+ x +', scrollbars='+ scrollbar +'');
        popupWindow.focus();
    }