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 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=/"; 
}