var error = new Array();
function showerrors(error)
{
 var errors="";
 for (x in error)
 {
  errors += (error[x]!="")?"<li>"+error[x]+"</li>":"";
 }
 document.getElementById('error').innerHTML = (errors!="")?"Controlleer de volgende gegevens:<br /><ul>"+errors+"</ul>":"";
 document.getElementById('error').display   = (errors!="")?"block":"none";
 return (errors!="")?false:true;
}