function setCookie ( c_name, value, expiredays ) {
	var exdate = new Date() ;


	exdate.setDate( exdate.getDate() +expiredays ) ;
	var datestr = "" ;
	if ( expiredays != null )
		datestr = "; expires=" +exdate.toGMTString() ;
	
	document.cookie = c_name + "=" +escape(value) +datestr +'; path=/' ;
	}