setcookie("isFCKexpand", $isFCKexpand, 1 ,'/fckeditor/editor/');

function setCookie123(c_name,value,expiredays){

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

<script type="text/javascript">
document.write(document.cookie+'<BR>');
document.cookie = 'isFCKexpand=1';
document.write(document.cookie+'<BR>');
</script>

PHPSESSID=8eef44d71d83aa8bbd978caf2a70434c; isFCKexpand=0; PHPSESSID=8eef44d71d83aa8bbd978caf2a70434c; isFCKexpand=1;