help with this script not quite working

I think it cant identify users???
<script type="text/javascript">

var blocklist



function block()

{

 getlist()

 var span = document.getElementsByTagName('span')

 if (span == null || blocklist.length <= 0) return false

 blocklist = blocklist.split(', ')

 for (x=0; x<blocklist.length; x++)

 {

  for (i=0; i<span.length; i++)

  {

   if (span[i].className == "normalname" && span[i].innerHTML.toLowerCase().match(blocklist[x].toLowerCase()))

   {

    var tempid = span[i]

    var found = 0

    for (a=0; found!=1; a++)

    {

     var parenttable = tempid.parentNode

     if (parenttable.tagName == "TABLE") var found = 1

     tempid = parenttable

    }

    if (found == 0) return false

    

    var div = parenttable.getElementsByTagName('div')

    if (div == null) return false

    var found2 = 0

    for (b=0; b<div.length; b++)

    {

     if (div[b].className == "postcolor" && found2 != 1)

     {

      div[b].innerHTML = "<CENTER><FONT color='red'><B>Post Blocked</B></FONT><BR><A href='" + loc.substring(0,loc.indexOf('showtopic=')) + "act=UserCP&amp;CODE=rblocker'>Manage Block List</A></CENTER>"

      found2 = 1

     }

     else if (div[b].className == "postcolor" && found2 == 1) div[b].style.display = 'none'

    }

   }

  }

 }

}



function getlist()

{

 var allcookies = document.cookie

 if (allcookies == ""){ blocklist = ""; return false }

 var pos = allcookies.indexOf("rblocker=")

 if (pos == -1){ blocklist = ""; return false }

 start = pos + 9

 var end = allcookies.indexOf(";", start)

 if (end == -1) end = allcookies.length

 var value = allcookies.substring(start, end)

 

 value = unescape(value)

 blocklist = value

}



function setblocklist()

{

 if (loc.match('act=UserCP&CODE=rblocker'))

 {

  getlist()

  var e = document.getElementById('ucpcontent')

  e.innerHTML = "<div class='maintitle'>Welcome to your control panel </div>" + "<div class='pformstrip'>Reply-Blocker List</div>"

  e.innerHTML += ("\n<div align='center'><p>" + 

        "\nType in the names of the users whose posts you want to block<BR>" + 

        "\n<b>Separate each name with a comma and a space (e.g. billy, bob, joe)</b><BR>&nbsp;<BR>" + 

        "\n<form name='rblockerpage'><textarea cols='65' rows='7' name='userlist' class='forminput'>" + blocklist + "</textarea><BR>" + 

        "\n<input type='button' value='Update Reply-Blocker' class='forminput' onClick='writecookie()'></form></p></div>")

 }

 var ucpsection = document.getElementById('ucpmenu').getElementsByTagName('P')

 for (x=0; x<ucpsection.length; x++)

 {

  if (ucpsection[x].innerHTML.match("Change Password"))

  {

   ucpsection[x].innerHTML += "<BR>· <a href='" + loc.substring(0,loc.indexOf('act=')) + "act=UserCP&amp;CODE=rblocker'>Set Reply-Blocker</a>"

  }

 }

}



function writecookie()

{

 var exp = new Date()

 exp.setFullYear(exp.getFullYear() + 1)

 var val = document.rblockerpage.userlist.value

 document.cookie = "rblocker=" + escape(val) + "; expires=" + exp.toGMTString()

 window.location = loc

}







var loc = window.location.toString()

if (loc.match('showtopic=')) window.onload=block

else if (loc.match('act=UserCP') || loc.match('act=Msg')) window.onload=setblocklist

</script>
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