well i fixed it.
i don't know why it was a problem, but i added a few px margin below the header and it seems to have resolved the issue
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.