function show_subscribe() {
	var cookie = read_cookie('subscribe');
	if (cookie == null || cookie == '') {
		document.getElementById('popup').style.display = 'block';
		document.getElementById('fade').style.display = 'block';

		// only show the cookie once
		create_cookie('subscribe', 1, 120);
	}
}

function hide_subscribe() {
	document.getElementById('popup').style.display = 'none';
	document.getElementById('fade').style.display = 'none';
}

function validate() {
	var valid = true;
	var errors = "The following errors were found: ";

	if (document.getElementById('subscribe_name').value == "") {
		valid = false;
		errors += "name is required, ";
	}

	if (document.getElementById('subscribe_email').value == "") {
		valid = false;
		errors += "email is required, ";
	}

	if (!valid) {
		errors = errors.substr(0, errors.length-2);
		errors += ".";
		document.getElementById('subscribe_errors').innerHTML = errors;
		document.getElementById('subscribe_errors').style.display = 'block';
		document.getElementById('popup').style.height = '300px';
	}

	return valid;
}

/* w3schools cookie functions */
function create_cookie(c_name,value,expiredays) {
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+
	((expiredays==null) ? "" : ";expires="+exdate.toUTCString());
}

function read_cookie(c_name) {
	if (document.cookie.length>0)
	  {
	  c_start=document.cookie.indexOf(c_name + "=");
	  if (c_start!=-1)
	    {
	    c_start=c_start + c_name.length+1;
	    c_end=document.cookie.indexOf(";",c_start);
	    if (c_end==-1) c_end=document.cookie.length;
	    return unescape(document.cookie.substring(c_start,c_end));
	    }
	  }
	return "";
}