/* set cookie */
function setCookie(c_name,value,exhours){
	var exdate=new Date();
	exdate = new Date (exdate);
	exdate.setHours (exdate.getHours() + exhours);	
	var c_value=escape(value) + ((exhours==null) ? "" : "; expires="+exdate.toUTCString());
	document.cookie=c_name + "=" + c_value;
}