You have chosen to open xxx.png ... 
        ...
      What should Firefox do ...
        O Open with ...
        O Save 

  <td width="10%"><a href="javascript:DisplayLargeVariant('A','aug');">aug</a></td>

function DisplayLargeVariant(Key, ChordVariant, Dir) { //  Routine to change the content of the bottom panel when the variant is changed
    ...
    var bottom = "";
    ...
    //  which builds the png file reference "bottom" => the appropriate file and then    
    //        displays the png in the bottom panel  via ...
    parent.bottom.location = bottom;
}

Firefox and Chrome appear to have a problem related to displaying large (page size) png files in frames. I have a series of frame based web pages that work fine with Internet Explorer, Safari, Opera, and Maxthon (i.e. they display the png's in the target frame). When I use FireFox (and Chrome), and click on the links to display the png files I receive the message ... You have chosen to open xxx.png ... ... What should Firefox do ... O Open with ... O Save My html window has 3 frames: - the top frame has links to control the middle frame content - the middle frame has links to control the bottom frame content The bottom frame displays the large (page size) png (bitmap) files. My links are coded as follows ... <nowiki> <td width="10%"><a href="javascript:DisplayLargeVariant('A','aug');">aug</a></td></nowiki> Which Calls ... <pre><nowiki>function DisplayLargeVariant(Key, ChordVariant, Dir) { // Routine to change the content of the bottom panel when the variant is changed ... var bottom = ""; ... // which builds the png file reference "bottom" => the appropriate file and then // displays the png in the bottom panel via ... parent.bottom.location = bottom; }</nowiki></pre>