How to change the accept from ".jpg,.gif" to "image/jpg,image/gif"?

[712059392]

Hi, I am running the Plupload v2.3.6, It's working very well on PC，but it's not work on my Android mobile phone, coz my phone cannot handle accept=".jpg,.gif" but only accept="image/jpg,image/gif", so could you please tell me how can I change the accept from ".jpg,.gif" to "image/jpg,image/gif"?
if I modify the code
mime_types: [ {title : "Image files", extensions : "jpg,gif"}, ],
to
mime_types: [ {title : "Image files", extensions : "image/jpg,image/gif"}, ],
the program will tell me the format is wrong.