Very small javascript is not running on php page

I have javascript working in similar pages, but for some reason this one page does not load the JS at all. It's not that the code isn't working (it's just a few lines), but on my code debugger (using chromes "inspect element" feature) the javacsript isn't even registered as a script.开发者_运维技巧 I suppose there is some issue in where I am placing it.

I have a header included at the top, then put the script immediately, as follows:

<? 
/* Include Files *********************/
require_once("common/header.php");
/*************************************/
?>

<script language="JavaScript" type="text/javascript">
    ClearSearch(){
        document.getElementById('search_q').value = '';
    }
</script>

Lower in the page, I have a button that calls this function onclick:

<input type="submit" name="submit_search" value="Show All" onclick="javascript:ClearSearch();">

When I click the button, not only is the text box not cleared, but the javascript doesn't seem to run at all. It's as if the script isn't being detected. Any ideas?

---

Missing function before your function declaration.

function ClearSearch(){
    document.getElementById('search_q').value = '';
}