function fvalidate_email(e) {
	ok = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM";
	for(i=0; i < e.length ;i++) {
		if(ok.indexOf(e.charAt(i))<0) { 
			return (false);
		}	
	}

	if (document.images) {
		re = /(@.*@)|(\.\.)|(^\.)|(^@)|(@$)|(\.$)|(@\.)/;
		re_two = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
		if (!e.match(re) && e.match(re_two)) {
			return (-1);		
		} 
	}
}


function validate_email(fieldvalue) {
	if(!fvalidate_email(fieldvalue)) {
		alert("Invalid email detected.");
		// make sure the form is not submitted
		return false;
	}
}