IE Errors on this webpage might cause it to work incorrectly

www.lsfiore.com

Windows Intenet Explorer

'document.getElementById(...)' is null or not an object

index.htm Line 16

Code: 0 Char: 2

<script type="text/javascript"><!----><![CDATA[><!--

sfHover = function() {

var sfEls = document.getElementById("nav").getElementsByTagName("LI");

for (var i=0; i<sfEls.length; i++) {

sfEls[i].onmouseover=function() {

this.className+=" sfhover";

}

sfEls[i].onmouseout=function() {

this.className=this.className.replace(new RegExp(" sfhover\\\\b"), "");

}

}

}

if (window.attachEvent) window.attachEvent("onload", sfHover);

//--><!]]></script>

<style>

Please help with this error. I cannot find a fix or workaround.

Thanks in advance