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 createCookie(deleteold,name,value) {
	if(deleteold == 't')
	{
		deleteCookie(name);	
	}
	var date = new Date();
	date.setFullYear(date.getFullYear()+1);
	var expires = "; expires="+date.toGMTString();
	document.cookie = name+"="+value+expires+"; path=/";
}

function deleteCookie( cookie_name )
{
	  var cookie_date = new Date ( ); 
	  cookie_date.setTime ( cookie_date.getTime() - 1 );
	  document.cookie = cookie_name += "=; expires=" + cookie_date.toGMTString();
}