How to call a javascript function after pressing enter key in input box

If you got the errors in IE browsers after calling some Javascript
functions on input box event, then user the following methodology
to get rid of it:

<input type="text" id="txtSearch" 
onkeydown="if (event.keyCode ==13) document.getElementById('btnSearch').click()"/>

<input type="button" id="btnSearch" value="Search"
onclick="doSomething();" /> 
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