[f] "extra register page" Convert

Code:
<script type="text/javascript">
<!--
/* extra register page by ross
http://101support.proboards43.com */
 
if(vf_username == 'guest') {
var td = document.getElementsByTagName('td');
var a = document.getElementsByTagName('a');
for(r=0; r<a.length; r++) {
if(a.item(r).href.match(/action/register/)) {
a.item(r).href="/action/preregister/";
}
}
for(e=0;e<td.length;e++) {
if(document.location.href.match(/action/preregister/)){
var forumName=document.title.split("- ")[0];
document.title=forumName+" - Register";
document.getElementsByTagName("font")[1].innerHTML="Register";
if(td[e].width=="100%" && td[e].vAlign=="top"){
var itab=td[e].innerHTML.split(/<br>(\s|\n)/i)[0];
var tab=td[e].innerHTML.split(itab)[1];
td[e].innerHTML="<a href='http://worldsapart.vforums.co.uk/'>"+forumName+"</a> :: Register"+tab;
}
if(td[e].innerHTML.match(/An Error Has Occurred/) && td[e].className=="title1") {
td[e].firstChild.innerHTML='Forum Rules and Registration Tips';
td[e+1].firstChild.innerHTML = document.getElementById('register').innerHTML;
var newCell=td[e].parentNode.parentNode.insertRow(2).insertCell(0);
newCell.className="window2";
newCell.innerHTML='<form action="/action/register/" method="post" onSubmit="disable(this)"><font size="-1">By Clicking Continue, you confirm that you have read and agree to the rules laid out above.</font> <input type="submit" value="Continue"></form>';
}
}
}
}
//-->
</script>