function setCookie(c_name,value,expireHours)
{
var exdate=new Date();
//exdate.setDate(exdate.getDate()+expiredays)
exdate.setTime(exdate.getTime()+36000*expireHours);
document.cookie=c_name+ "=" +escape(value)+
((expireHours==null) ? "" : ";expires="+exdate);
}