function popupwindow(destination)
{
var iHeight;
var iWidth;
var iTop;
var iLeft;
var sWinProp;
var sMiddleFrame;
var WWWwin;
// iHeight = screen.availHeight / 2;
iHeight = 450;
iWidth = screen.availWidth / 2;
sWinProp = "resizable=yes,menubar=yes,scrollbars=yes,status=yes,toolbar=yes,location=yes";
if (navigator.appName.indexOf("Microsoft") != -1)
    {
    iTop = 0;
    iLeft = iWidth;
    sWinProp = sWinProp + ",left=" + iLeft + ",top=" + iTop + ",width=" + iWidth + ",height=" + iHeight;
    }
else
    {
    iTop = screen.availTop;
    iLeft = screen.availLeft + iWidth;
    sWinProp = sWinProp + ",outerWidth=" + iWidth + ",outerHeight=" + iHeight + ",screenX=" + iLeft + ",screenY=" + iTop;
    }
wwwwin = window.open(destination, "", sWinProp);
}