Simple Popup Question

I looked at the archives, but only found elaborated popup things, not some unspecific help.

I just want to open a popup. This should work:

New Window

But I have *no* idea where to put this JAVA Code:


function NewWindow () {
MyWindow = window.open("bla2.htm", "secondwindow", "width=300,height=200,scrollbars");
MyWindow.focus();

Thanks.