This is very important to remember for a few reasons. Any object within
the DOM that is not named or given an "id" can be accessed "hollywood
style" in order of appearance on the document. For instance if I
wanted to accessthe data typed in by the user in the first element of
a form that was the first on a page I could get at it by document.form[0].element[0].value
It is not required but does give you more control over size etc. of the
new window you are opening.