If you delete the png file, be sure to set the imageFont parameter to null in the configuration, so that MathJax will not try to use image fonts. Peter is right, they are intended for use with browsers that donβt process @ font-face CSS directives (including iPhone / iTouch / iPad, although iOS4.2 now handles it correctly, and MathJax should handle it soon), but also used for Firefox, when MathJax is loaded from a local file (file: // URL), which is not in the same directory or in a subdirectory of the one that contains the HTML file that loaded it. If you are not in any of these situations, you can remove the image fonts.
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