ohadi

Ok, Nobody helps me.. I did it and tel you the solution:

put this code in your style.css

@media screen and (max-width:640px)
.sidebar {
display: none;
}

Done.

This is my theme, I don’t know what is that name..

http://up.iranblog.com/images/3hv88wv2fptebu9t96zk.zip