jQuery Dialog: unable to find images

I used jQuery UI Dialog and it works fine. But When I checked it in Firebug 1.11.4, it displays this message in the console:

I'm using jQuery-1.7.1 and jQueryUI-1.8.16. And this is how I call my dialog:

$("#GlobalDialogBox").dialog({
        title: dialogTitle,
        resizable: false,
        modal: true,
        buttons: buttonSet
 });

I dont know what's wrong. Everything works fine though. No Errors. But why is this message showing?

NOTE:

I have ALL the images it requires but it points to this directory

/Content/themes/AppData/Local/Microsoft/Windows/Temporary%20Internet%20Files/Low/Content.IE5/VSNHM06S/images

while my images is in

Content/themes/base/images

And it only happens on the first time I call the dialog. Any ideas?