function trim(s) {
  while (s.substring(0,1) == ' ') {
    s = s.substring(1,s.length);
  }
  while (s.substring(s.length-1,s.length) == ' ') {
    s = s.substring(0,s.length-1);
  }
  return s;
}

function validEmaila(){
	var txt_email 	= document.emailform.email;
	var trim_email 	= trim(txt_email.value);
	var email_regex = /^[_A-Za-z0-9-]+(\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\.[A-Za-z0-9-]+)*\.(([A-Za-z]{2,3})|(aero|coop|info|museum|name))$/;
	if(!email_regex.test(trim_email))
	{
		if(txt_email.value == ""){
			alert("Please enter an email address.");
			txt_email.focus();
		}
		else{
			alert("The email address you entered is not valid.");
			txt_email.focus();
		}
		return false;
	}
	return true;
}

/*function validEmaila(email) {
	url = emailform.email.value;
	if (url != null && url != "") {
		a = url.lastIndexOf("@");
		b = url.lastIndexOf(".");
		c = url.indexOf(":");
		d = url.indexOf("/");
		e = url.substring(0,a);
		f = e.indexOf("@");
		g = url.substring(a+1,url.length);
		h = g.indexOf("[");
		i = g.indexOf("]");
		j = g.indexOf("<");
		k = g.indexOf(">");
		l = url.substring(a+1,b);
		m = url.substring(b+1,url.length);
		n = url.substring(0,a);
		o = 0;
		if (a > b) {o++};
		if (c != -1) {o++};
		if (d != -1) {o++};
		if (f != -1) {o++};
		if (h != -1) {o++};
		if (i != -1) {o++};
		if (j != -1) {o++};
		if (k != -1) {o++};
		if (l.length < 2) {o++};
		if (m.length < 2) {o++};
		if (n.length < 1) {o++};
		if (o == 0) {
			//document.location = "/includes/subscribe.cfm?" + url;
			return true;
		} else {
			alert("You have entered an invalid email address!");
			return false;
		}
	} else {
		alert("You have entered an invalid email address!");
		return false;
	}
}*/