/* add to cookie as a collection */
function addToCookie(cookieName, input){
	var x;
	var currentList = getArrayFromCookie(cookieName);
	for(x in currentList){
	  if(input == currentList[x]){
	    return; //do not add to list.
	  }
	}

	var buffer = readCookie(cookieName);
	if(buffer == null){
	  createCookie(cookieName, "", 365);	  
	}else{
		buffer = buffer + "_=,=_" + input;
		createCookie(cookieName, buffer, 365);	
	}
}

/* Cookie util methods - read */
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;
}

/* Cookie util methods - create */
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=/";
}

/* Cookie util methods - read */
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;
}

/* Cookie util methods - erase */
function eraseCookie(name) {
	createCookie(name,"",-1);
}


/* get array from cookie */
function getArrayFromCookie(cookieName){
	//get all contents from this cookie, find the one to remove, and rejoin all others.
	var buffer = readCookie(cookieName);
	//alert("cookieName:"+cookieName + " buffer:" + buffer);
	if(buffer != null){
		var buffList = buffer.split("_=,=_");
		return buffList;
	}else return null;
}