function pm(val1, val2)
{
 if( (val1 != 0) && (val1 != val2) )
 {
  document.getElementById('Versturen').disabled=false;
  document.getElementById('Versturen').src='http://www.klen.nl/beta/img/sendpm.png';
 }
 else
 {
  document.getElementById('Versturen').disabled=true;
  document.getElementById('Versturen').src='http://www.klen.nl/beta/img/sendpm-off.png';
 }
}