Form application logic

I'm trying to get a form screen to show if two other form
screens are visible.



on(action)

{

if ((this._parent.form1.visible=true) %26amp;%26amp;
(this._parent.form2.visible-true)){

this._parent.form3.visible=true;

} else {

this._parent.form3.visible=false;

}

}



This doesn't work, for probably obvious reasons, but I'm
stumped. Does anyone have a solution? I know I'm reinventing the
wheel here...



Jon