How creat a FileBrowser button to open Image/Flash type link

hi, i want to creat a filebrowser button,
so i do the code like:

            {
                type:'button',
                id:'browse',
                align:'center',
                label:e.lang.common.browseServer,
                hidden:true,
                filebrowser:'info:MusicUrl'
                }

when i onclick it, it just always popup FileBrowser page like:
http://127.0.0.1/editor/ckeditor/ckfinder/ckfinder.html

but i want to open popup the url:
http://127.0.0.1/editor/ckeditor/ckfinder/ckfinder.html?type=Images

how do i do the code?
:cry: anyone can help me?