Hello everyone, I have a search box and a buttion. currently a user enter some text and press the search button. But I want to add another feature that instead of clicking the search button people can hit enter to search. How can I do that?

Here is my code sample:

<form method="post" action="">

     <input id="search" name="search" type="text" />
     <input id="search_btn" name="search_btn" type="submit" />

</form>

Thanks in advance