Delete instruction

hi all,
I’ve got a minor issue with a non-functioning delete instruction in a onEnterFrame statement. Here’s the code

this.onEnterFrame = function() {
if ((_root.gira1 == 1) && (_root.gira2 == 1) && (_root.gira3 == 1) && (_root.gira4 == 1)) {
gotoAndPlay(“action”);
delete this [“onEnterFrame”];
_root.tunnelaperto = 1;
}
}

what you suggest? Till now “delete this [“onEnterFrame”]” always went allright… :frowning:

thx in advance