[jQuery] big problem with $.ajax

Hello,
I've discovered jquery a few days ago and I'd say a big a "thank you" to the
developpers team because it's really, really useful. :handshake:
But I have a problem with the $.ajax function : I'm working under mozilla FF
with a plugin called 'developper bar' wich return me the JS errors.
This a part of my code :
$.ajaxSetup({type:"GET", url:CFG["gatewayScript"]});
    $.ajax({
        type:"GET",
        url:CFG["gatewayScript"],
        type:"GET",
        success:function(data, textStatus){
            alert (data);
            $("#render_box").html(' '+DIR_WS_INSTALL+data+' ');
        },

data:"tileBaseDim="+CFG["G_tileBaseDim"]+"&nbTotalZoom="+CFG["G_maxZoom"]+"&zoom="+selectZone_zoom+"&xorig="+topLeftTile_coords.x+"&xend="+bottomRightTile_coords.x+"&yorig="+topLeftTile_coords.y+"&yend="+bottomRightTile_coords.y+"&n="+CFG["G_server_n"]+"&v="+CFG["G_server_v"],
        dataType:'text',
        error:function(XMLHttpRequest, textStatus, errorThrown){
            alert ("error");
        }
    });
FF tells to me that "s.url" has no properties on line #2259 (unpacked 1.2
version).
I was constrained to put the ajaxSetup function before $.ajax because there
was the same bug with S.type.
I think there's a bug because, as a test, I tryied to remove the line #2199
in the unpacked 1.2 version and then it work correctly (it's the line where
ajaxSettings and the request settings are merged).
I don't like modify the externals libraries because when there's a new
version, I must do it another time, it's bad.
So what can I do in my script to work properly?
Thanks for your help.
STC_wizzard
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