function CorrectEmailaddress(SubscriberForm){
if (SubscriberForm.pf_Email.value.length > 255)
{
alert("Max 255 characters allowed the \"E-mail\" field");
SubscriberForm.pf_Email.focus();
return (false);
 }
if (SubscriberForm.pf_Email.value == "")
{
alert("Please write an e-mail.");
SubscriberForm.pf_Email.focus();
return (false);
 }
if (SubscriberForm.pf_Email.value.length < 7)
{
alert("Your e-mail have to be at least 7 characters long.");
SubscriberForm.pf_Email.focus();
return (false);
 }
pf_Email=SubscriberForm.pf_Email.value
at=pf_Email.indexOf("@");
lastat=pf_Email.lastIndexOf("@");
dot=pf_Email.lastIndexOf(".");
if(at<1||at!=lastat||dot<at){
alert("Your e-mailadress is not valid. please try again");
return false;}
}