[MrNase]

I checked your code three times and couldn't point out where the error was so here's another solution to this. I hope this one solves it.

open ajax_checkusername.js and replace:

submit    = document.register.submitform;

with

submit    = document.getElementById('submitform');

and change (in the template 'register') this:

<div style="margin-top:$stylevar[cellpadding]px"><input type="submit" class="button" value="$vbphrase[complete_registration]" accesskey="s" name="submitform" /><input type="reset" class="button" name="Reset" value="$vbphrase[reset_fields]" />

to this:

<div style="margin-top:$stylevar[cellpadding]px"><input type="submit" class="button" value="$vbphrase[complete_registration]" accesskey="s" id="submitform" /><input type="reset" class="button" name="Reset" value="$vbphrase[reset_fields]" />

Please try that and tell me if it's working

__________________________________________________ ___

Here's another solution that came up after some google searches.
Open ajax_checkusername.js and replace:

function checkName(input, response)
{
  if (response != ''){ 
    // Response mode
    message   = document.getElementById('nameCheckFailed');
    submit    = document.register.submitform;
    
    if (response == 1){
      message.className = 'registererror';
      submit.disabled = true;
    }else{
      message.className = 'registererrorhidden';
      submit.disabled = false;
    } 
  }else{
    // Input mode
    url  = 'register.php?do=checkusername&username=' + input;
    loadXMLDoc(url);
  }

}

with:

function checkName(input, response)
{
  if (response != ''){ 
    // Response mode
   var message   = document.getElementById('nameCheckFailed');
   var submit    = document.register.submitform;
    
    if (response == 1){
      message.className = 'registererror';
      submit.disabled = true;
    }else{
      message.className = 'registererrorhidden';
      submit.disabled = false;
    } 
  }else{
    // Input mode
    url  = 'register.php?do=checkusername&username=' + input;
    loadXMLDoc(url);
  }

}

This error seems pretty strange to me since the same code is working fine for me