Print a document using JavaScript

How can i add to my site a button and when user presses that button, the site prints itself...?

Thanks in advance.

<a href="javascript:window.print();">Print</a>.... as far as I know, you can only print one page at a time rather than the whole site, without doing some server side stuff.

<a href="#" onClick="window.print();return false">druck mich </a>

I get an error when i press the button (or link) or image(with link)
I've tried with all and get this error:
(tried with window.print()) as i was told...

...
"The object don't accept this property or method"
...
Do you want to keep executing JavaScript on this page?
YES NO

Does anyonw have a working example?
I'm newbie at JAvaScript... as you may have noticed...

Thanks...

Maybe i have to replace window by _self or by _parent ?