help on understanding the demo code

[<george@dakotacom.net>]

******    message to minivend-users from <george@dakotacom.net>     ******

Hi there,
  I try to understand this piece of code in the ord/basket.html file with
very little luck.

  <INPUT TYPE="CHECKBOX" NAME="mv_order_item"
    onClick="document.forms[0].action='[process-target]',
                                        document.forms[0].submit()"
     VALUE="[loop-code]">

  The portion I have difficulity understanding is document.forms[0].action
 and document.forms[0].submit(). What kind of datastructure is "document"
and where is the definition? Where does the code reside?  Where is the syntax? 

  I went through the document and the archives and found nothing. Could
anyone tell me tell me where to find the answer?

  Thanks.

--George

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