Pictures doesn't have alt attribute

Hello,

When I analyse a page with SEO Quake for exemple, it report that there is no “alt” attribute in all pictures (Yet, I define them when I’ve imported the picture).
When i analyse the code with mozilla, there is no “alt” too. (You can see in joined files) Do you have a solution to modify the code to integrate “alt” attribute with pictures to have a better SEO ?

Thanks in advanced