Opening Java Window - Explorer v Firefox Conflict

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Gentleman:

I just added a Java window to an ASP web page which shows an enlarged graphic. This works perfectly in Explorer, however it does something unusual in Firefox. Firefox opens a user request interface which asks the following:

What should Firefox do with this file:

Open With ... etc
or
Save

Neither option will open the new graphic in the Java window as it does in Explorer. Following is the code that I am using to open call the Window and get the graphic:

IN THE HEADER

<%--Large WIndow Scripts --%>
<script type="text/javascript">
function OpenLargeWindow1(image)
{
window.open("Ads/" + image, "", " width=760,height=300,top=200,left=200,scrollbars=0").focus();
}
</script>


IN THE BODY

<a href="javascript:OpenLargeWindow1('gears33.png')">
<asp:Image ID="Image18" runat="server" ImageUrl="~/Ads/plus_sign.png" /></a>

Does Firefox require a proprietary code or what option in the select process will put the graphic in the window if any? OR ???.

Any insight to this dilemma is appreciated.

Thank You, Pat