/*
 * reset cookie and navigate to intro window
 */
function navigate_to_intro(){
	eraseCookie('lang_selected');
	window.location.href = '/index.php?id=10185';
}

function check_lang_selection(){
	return readCookie('lang_selected') ? true : false;
}

function set_lang(lang){
	createCookie('lang_selected', lang, 365);
}

/*
 * cookie create/read/delete from quirksmode.org
 */
function createCookie(name, value, days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}

function changeLetterSubject(){
  jQuery.noConflict();
  var sysfields = jQuery("input[name=_systemfield]");
  var values = sysfields.val().split("|||");
  values[values.length-1] = jQuery("#er_subject").val()
  sysfields.val(values.join("|||"));
}