type=submit not calling onsubmit javascript code for its action

i can't figure out where my mistake is.  please help me get this html form to call the javascript function
it's not calling it at all now as the alert is not popping up.
<script ...............>
function fviewcomment_submit(f)
{
    var pattern = /(^\s*)|(\s*$)/g; // \s &#44277;&#48177; &#47928;&#51088;
    if (!f.getElementById('postText').value)
    {
        alert("please enter a comment");
        return FALSE;
    }

    alert ("here");
    alert (f.wr_key.value);
    if (typeof(f.wr_key) != 'undefined')
    {
        if (hex_md5(f.wr_key.value) != md5_norobot_key)
        {
            alert('the red letters don\'t match.  &#51088;&#46041;&#46321;&#47197;&#48169;&#51648;&#50857; &#48744;&#44036;&#44544;&#51088;&#44032; &#49692;&#49436;&#45824;&#47196; &#51077;&#47141;&#46104;&#51648; &#50506;&#50520;&#49845;&#45768;&#45796;.');
            f.wr_key.focus();
            return FALSE;
        }
    }

    return TRUE;
}
~
</script>
<div align=center>
<form name=postMsg action="index.php"  autocomplete="off"   method=post class=formStyle>
<table class=forums>

{$mainPostForm}

<tr>
<td class=caption5><INPUT TYPE=SUBMIT  onclick="javascript:fviewcomment_submit(document.postMsg);" VALUE="{$l_sub_post_msg}"  class=inputButton tabindex=5 ></td>
</tr>
</table>
<INPUT TYPE=HIDDEN NAME=subaction VALUE="pthread">
<INPUT TYPE=HIDDEN NAME=forum VALUE="{$forum}">
<INPUT TYPE=HIDDEN NAME=topic VALUE="{$topic}">
<INPUT TYPE=HIDDEN NAME=anchor VALUE="{$anchor}">
</form>
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