Why do I not have to use "window." every time?

I have a global variable:
aa_pageNameTypeURL

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Should I use "window.'" every time I reference this variable? What are the pros/cons?
window.aa_pageNameTypeURL;

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894359Asked:
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leakim971PluritechnicianCommented:
<< window. >> make your variable global which mean accessible to everywhere in your page by any javascript code
if you are in a function and use << var aa_pageNameTypeURL = foo >>, aa_pageNameTypeURL is only available in the function.
Google about "javascript scope" to learn more
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