popup window

I am working on a popup window while I am testing AW controls. The following javascript works fine:

var win;
function pop(){
win=window.open('','');
win.moveBy(100,100);
}

However, if I use a separate function to operate "win.moveBy(100,100);", I got error.

var win;
function pop(){
win=window.open('','');
}
function move(){
win.moveBy(100,100);
}

What am I wrong?

Thanks,

When I do this I normally do something like:

function pop(name) {
  window[name] = window.open(',");
}

function move(name) {
  window[name].moveBy(100,100);
}

Thanks Mike! I tried but got an error. How do you declare "window[]"?

Sorry Mike! It's my mistyping fault. It works in your way. Thanks again!