Possible to call a Javascript method in the context of another window?

Question

Say you have a global function alert2:

function alert2(msg) {
    window.alert(msg);
}

And you also have a reference to a second window obj

Answer 1

You can use childWindow.opener to get the window object that opened the child window.

alert2.call(childWindow.opener, "called from child using parent as context");

Demo: http://jsfiddle.net/hJ7uw/8/