missing sprites.png

There's a line in the custom.css (line 55) that reads:#Form_Go{top: 9px; right: 10px; background: url('http://vanilla.com/applications/dashboard/design/images/sprites.png') 0 -196px no-repeat transparent !important;}
There is no such file. Can this be fixed?
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I found a sprites file here on Vanilla so I just replaced the link with a pointer to that (after putting it on my website). I haven't noticed anything different and nothing seems to be broken. If anyone knows if there's another file I should be using, do tell