Your insert and redirect code is below the <html> tag... That won't work in php. You need to redirect before the page starts loading. Just move that code up above the <html> tag and this error should go away.
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.