passing variables

Is it just IE or why can I not pass variables in a textbox when the user presses enter inside of the textbox. Should I have to disable the enter key in the textfield to restrict the submit to the button? It seems like it should be more practical than this.
I apologize for messy code.
In the html index file
<javascript>
function noenter() {
return !(window.event && window.event.keyCode == 13); }
;
</javascript>
</form html>
<form method="POST" action="mnarecords.php">
<table width="422" border="0" cellspacing="0">
<tr>
<td width="301">
<input type="text" name="searchstring" onkeypress="return noenter()" size="50">
</td>
<td width="288">
<select size="1" name="searchtype">
<option selected value="value">value</option>
</select>
</td>
</tr>
</table>
<table width="422" border="0" cellspacing="0">
<tr>
<td width="180">
</td>
<td width="57">
<input type="submit" value="SEARCH" name="B1" class="button1">
</td>
<td width="179">
</td>
</tr>
</table>
</form>
</form html>

<in the php file to display according to variables>
$searchType = $_POST['searchtype'];
$searchString = $_POST['searchstring'];
</in the php file to display according to variables>

These variables will not fill when the user presses enter in the textbox. Very Frustrating.

Thanks in advance.