With love, I found the solution with the help of Allah. I opened the picture in the simple paint program and resave the picture after a simple modification. After that it word with no problem.
That hade happened with me before in a another picture, the browser wasn't understanding it's format, so I reformatted the picture with ACDSee and it worked, and this time I thank it is the same problem.
Error 304 with jpg or gif pictures is unknown format.