web parts - should they contain the form tag

My aspx page contains a region which is populated trough ajax. The pupulated content is that of the page MyWebpart.aspx. But MyWebpart.aspx contains not only a grid(which is what I need to get trough ajax), it also contains , , , t开发者_运维百科ags because this are required for any aspx file. Is there any problem with this?

code to replace inner html with that received from webpart

displayElement.innerHTML += executor.get_responseData();

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I need to avoid InnerHTML, and create a new tag, than add it as a chield, and the form tag creates no problems