First question, are you just changing the images extention name (example: .png to .gif) without having it properly exported to that format. If you are just changing the name of logo.psd to logo.gif then it will never work.
It has to be converted through software such as photoshop or fireworks.
Now if you have doen that then you may not have converted it to the proper format or the name is wrong.
such as if the name it is looking for is logo_header.jpg and you changed it to logo.gif, there is you problem again, but that can easyly be changed by going into the css and editing it to the name you want. If not then it is a naming error.
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