var testresults

function checkemail(){
 var str=document.form.emailadres_kattenmail.value
 var filter=/^.+@.+\..{2,3}$/

 if (filter.test(str))
    testresults=true
 else {
    alert("Vul alstublieft uw e-mail adres in.")
    testresults=false
}
 return (testresults)
}

function checkbae(){
if (document.layers||document.all)
return checkemail()
else
return true
}


function checkform ( form )
{
  // http://www.thesitewizard.com/archive/validation.shtml
  if (form.emailadres_kattenmail.value == "") {
    alert( "Vul alstublieft uw e-mail adres in." );
    form.emailadres_kattenmail.focus();
    return false ;
  }
  return true ;
}