initialised = -1;

function BuildObject(obj)
{
  if (-1 < initialised)
  {
    objContainer.css.visibility = 'hidden';
    objContainer.css.display='none';
  }

  initialised = 1;

  this.css=bw.dom?document.getElementById(obj).style:bw.ie4?document.all[obj].style:bw.ns4?eval('document.'+obj):0;
  this.css.display='inline';
  this.css.visibility = 'visible';
  return this;
}

function InitialiseLayer(nummer)
{
  if (bw.ns4)
  {
    alert ('Bitte überprüfen Sie Ihre Angaben!');
  }
  else
  {
    objContainer=new BuildObject('error' + nummer);
  }

  return false;
}

function validate(feld, muster)
{
  var reg = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;

  if ( '' == feld )
  {
    return InitialiseLayer(0);
  }

  if ( 1 == muster && !reg.exec(feld))
  {
    return InitialiseLayer(1);
  }

  return true;
}