function setCookie(c_name,value,expiredays){

	if (!expiredays) expiredays=1;

	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+
	((expiredays==null) ? "" : ";expires="+exdate.toGMTString());

}