function validate() {
	var form = document.forms['email_Form'];
	var i;
	var errorMessage = '';

// check format of email !
	if(form.email.value == ''){ 
		errorMessage = errorMessage + 'Please enter a valid email address.\n' ;
	}else{
		apos=form.email.value.indexOf("@")
		dotpos=form.email.value.lastIndexOf(".")
		if (apos<1||dotpos-apos<2) 
			errorMessage = errorMessage + 'Please enter a valid email address.\n' ;
	}

	if(errorMessage != "") {
		alert(errorMessage);
	} else {
		form.submit();
	}
	errorMessage = "";
}