image/pjpeg和image/jpeg问题

传图片时,ie会把 jpg、jpeg翻译成image/pjpeg,png翻译成image/x-png 。而火狐则很标准:jpg、jpeg翻译成image/jpeg,png翻译成image/png。 
为了避免这个问题,我在多个浏览器上做了测试,结果如下:

firefox image/jpeg image/bmp image/gif image/png

ie 6 image/pjpeg image/bmp image/gif image/x-png

ie 7 image/pjpeg image/bmp image/gif image/x-png

ie 8 image/pjpeg image/bmp image/gif image/x-png

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