I has found this on this forum:

_root.shareObj = SharedObject.getLocal("shareObj");
if (_root.shareObj.data.check == "here") {
gotoAndStop(43);
} else {
_root.shareObj.data.check = "here";
_root.shareObj.data.flush();
}

and that´s work....

but, how to eliminate this cookie???

on my case i need eliminate after close the browser window.

P.s. Sorry about my english!!!