// Newsletter submit validation
function submitform() {
	if  (document.sub_form.email_addr.value=='')

		// No email address provided
		alert("This email address is not valid");

	else {
		if ( ((document.sub_form.email_addr.value.indexOf('@',1))==-1)||(document.sub_form.email_addr.value.indexOf('.',1))==-1 )

			// email address not properly formatted
			alert("This email address is not valid");

		else
			document.sub_form.submit();
	}
}