Hello I've been trying to figure out with a search box I've added how it can submit by pressing the 'enter' key rather than just clicking a 'submit' button beside a form. I've tried onkeypress but as soon as you press one button the field submits. I've also seen you can do with keycode==13 but I'm not sure how to add it into my code. I've pasted my code in below. Any help would be much appreciated.

Code:
<input type="text" name="Search" id="Search" class="searchBox" />
    <a href="#" onclick="getContentURL(Search.value);"><img src="/img/magnifying-glass.gif" class="searchImg" /></a>
    <script type="text/javascript"> 
function getContentURL(sSearch){
window.location ="/search/pages/Results.aspx?k="+sSearch+"&s=All%20Sites";
}
</script>