var testresults
function checkemail() {
var str=document.form10401.field18121.value
var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
if (filter.test(str)=='') {
document.getElementById('nieuwsbriefsubmit').disabled=false;
testresults=true
} else {
document.getElementById('nieuwsbriefsubmit').disabled=true;
/*alert("Please input a valid email address!")*/
testresults=true
}
return (testresults)
}

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