/*
   name - name of the cookie
   value - value of the cookie
   [expires] - expiration date of the cookie
     (defaults to end of current session)
   [path] - path for which the cookie is valid
     (defaults to path of calling document)
   [domain] - domain for which the cookie is valid
     (defaults to domain of calling document)
   [secure] - Boolean value indicating if the cookie transmission requires
     a secure transmission
   * an argument defaults when it is assigned null as a placeholder
   * a null placeholder is not required for trailing omitted arguments
*/

function setCookie(name, value, expires, path, domain, secure) {
  var curCookie = name + "=" + escape(value) +
      ((expires) ? "; expires=" + expires.toUTCString() : "") +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      ((secure) ? "; secure" : "");
  document.cookie = curCookie;
}


/*
  name - name of the desired cookie
  return string containing value of specified cookie or null
  if cookie does not exist
*/

function getCookie(name) {
  var dc = document.cookie;
  var prefix = name + "=";
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) {
    begin = dc.indexOf(prefix);
    if (begin != 0) return null;
  } else
    begin += 2;
  var end = document.cookie.indexOf(";", begin);
  if (end == -1)
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}


/*
   name - name of the cookie
   [path] - path of the cookie (must be same as path used to create cookie)
   [domain] - domain of the cookie (must be same as domain used to
     create cookie)
   path and domain default if assigned null or omitted if no explicit
     argument proceeds
*/

function deleteCookie(name, path, domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}

function hide(id) {
	document.getElementById(id).style.visibility = 'hidden';
}


function registered() {
	// create an instance of the Date object
	var now = new Date();
	
	/*
	cookie expires in one year (actually, 365 days)
	365 days in a year
	24 hours in a day
	60 minutes in an hour
	60 seconds in a minute
	1000 milliseconds in a second
	*/
	
	now.setTime(now.getTime() + 365 * 24 * 60 * 60 * 1000);
	var visits = getCookie("counter");
	
	// if the cookie wasn't found, this is your first visit
	if (!visits) {
	  visits = 1; // the value for the new cookie
	} else {
	  // increment the counter
	  visits = parseInt(visits) + 1;
	}
	// set the new cookie
	setCookie("counter", visits, now, '/');
	
	// -->
}

function check_registered() {

	var visits = getCookie("counter");
	
	// if the cookie wasn't found, this is your first visit
	if (!visits) {
		null;
	} else {
		hide("register_btn");
	}

}