function checkIE() {
    var useragent = navigator.userAgent;
    var pos = useragent.indexOf('MSIE');
    if (pos > -1) {
        return true;
    } else {
        return false;
    }
}

function checkit(form) {
    var name = escape(form.username.value);
    new Ajax.Request('/checkusername/', {
        method: 'post',
        parameters: 'username='+name, 
        onSuccess: function(xh) { 
            var rs = xh.responseText;
            if (rs == 'taken'|| rs == 'not acceptable - user names must have 4-15 characters, and only alphanumeric characters') {
                $('checkitvalue').innerHTML = '<strong style="background: url(/img/deny.png) 0 1px no-repeat; padding-left: 16px; font-size: 85%; color: #c00;">Sorry, the username "'+name+'" is '+rs+'.</strong>';
                form.submit.disabled = 'disabled';
            } else {
                $('checkitvalue').innerHTML = '<strong style="background: url(/img/confirm.png) 0 1px no-repeat; padding-left: 16px; font-size: 85%; color: #090;">Great, the username "'+name+'" is '+rs+'.</strong>';
                form.submit.disabled = '';
            }
        }
        });
    return false;  
}

function enablebutton(button, button2, target) {
  var string = target.value; 
  button2.disabled = false;
  if (string.length > 0) {
    button.disabled = false;
  } else {
    button.disabled = true;
  }
  var target2 = $('commentcaptcha');
}