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) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	var cr = "";
	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) {
			if (cr.length>0) { cr = cr+';'; }
			cr = cr+c;
		}
	}
	document.cookie = cr;
}

function hasCookie(name) {
	var cook = readCookie(name);
	return(cook!=null);
}


function addCookie(name,value,days) {
	var v = readCookie(name);
	if ((v==null) | (v=='NaN')) { v = 0; }
	eraseCookie(name);
	createCookie(name,(parseInt(v)+parseInt(value)).toString(),days);	
}