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    <p>Look into <a href="http://www.asp.net/ajax" rel="nofollow noreferrer">AJAX</a> for handling refreshing part of the page assuming that you do mean to go back to the server for the menu. The jQuery suggestion from Rafael also has a lot of merits for another way to solve this.</p> <hr> <p>There are at least 2 different cases based on what you describe and it may be worth illustrating both:</p> <ol> <li><p>Menu fly-outs - This is where the user hovers or clicks on something in the navigation bar and a set of other choices come out. For example, on a grocery site there may be a "Meat" option that you click that then lists various types of meat like Beef, Pork, Chicken, etc. This can be done purely with Javascript and doesn't require trips back to the server necessarily.</p></li> <li><p>Updating the body of the page - This is where you want the guts of the page to change though you need to understand that the URLs the server gets are a little different than what the user will see. Where I work we have a way of marking certain URLs to be AJAX URLs and so they only render that small portion that is needed rather than the whole page. This does carry the downside that the URL in the browser isn't changing so if someone does bookmark it they may get the wrong page, just to warn you now. It is a concern in a sense because if someone tries to hit the wrong page, the application has to handle this gracefully or else they may think the application is down and call you saying, "Are you down?"</p></li> </ol> <p>Each of these scenarios makes sense ot my mind as you may have to get a little more specific with what you are doing here and how this is structured.</p>
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