function Validate2()
{
    if(document.getElementById("cboContact").selectedIndex==0)
    {
        if (document.getElementById("txtPrefix").value=="")
        {
            alert("Please select a Manufacturer");
            document.getElementById("cboContact").focus();
        }
        else
        {
            prefix = document.getElementById("txtPrefix").value;
            strURL = "Popup.aspx?Mode=C&pre=" + prefix
            openWindow(strURL, "New", 450, 275, 1);
            document.getElementById("txtPrefix").value = "";
        }
    }
    else
    {
        intRowID	=	document.getElementById("cboContact").value;
        strURL	=	'Popup.aspx?Mode=C&ID='+intRowID
        openWindow(strURL,'New',450,275,1);
        document.getElementById("cboContact").selectedIndex = 0;
    }
}

function openWindow( pageToLoad, winName, width, height, center) 
{
    xposition=0; yposition=0;
    if ((parseInt(navigator.appVersion) >= 4 ) && (center))
    {
        xposition = (screen.width - width) / 2;
        yposition = (screen.height - height) / 2;
    }
    args = "width=" + width + ","
    + "height=" + height + ","
    + "location=0,"
    + "menubar=0,"
    + "resizable=0,"
    + "scrollbars=1,"
    + "status=0,"
    + "titlebar=0,"
    + "toolbar=0,"
    + "hotkeys=0,"
    + "screenx=" + xposition + ","  //NN Only
    + "screeny=" + yposition + ","  //NN Only
    + "left=" + xposition + ","     //IE Only
    + "top=" + yposition;           //IE Only
    chatWin=window.open( pageToLoad,winName,args);
}