function validEmail(email) {
			invalidChars = " /:,;"
	
			if (email == "") {
				return false
			}
			for (i=0; i<invalidChars.length; i++) {
				badChar = invalidChars.charAt(i)
				if (email.indexOf(badChar,0) > -1) {
					return false
				}
			}
			atPos = email.indexOf("@",1)
			if (atPos == -1) {
				return false
			}
			if (email.indexOf("@",atPos+1) > -1) {
				return false
			}
			periodPos = email.indexOf(".",atPos)
			if (periodPos == -1) {
				return false
			}
			if (periodPos+3 > email.length)	{
				return false
			}
			return true
		}

		function submitEmail(mailing_list) {
					// ** START **
           if (mailing_list.blank.value != "") {
           alert( "Stop Spamming" );
           mailing_list.blank.focus();
           return false ;
           }
          // ** END **
			if (!validEmail(mailing_list.email.value)) {
				alert("Invalid email address")
				mailing_list.email.focus();
				return false;
			}
			return true;
		}