Way to Identify preceding page?

Hello there......

Is there a variable that can be queried to determine what the address of the
* preceding * page was?

For example..... site contains pages "A" , "B" ,  C"   and  "D" (page "D"
contains a form that when filled in must send the user back to the page he
came from).  User goes from page "A"  to page "D" (via a link). Is there a
way for code on page "D" to know the user came from page "A" (perhaps a
system variable or something).

--
Take care..........     -=JB=-     >==<  >==<
jameskb(at)mindspring.com
36 09' 57" N    86 47' 04" W

"A ship is safe in the harbor, but that is not why ships are built."

"Message created on 22 Jan 00 at 1742 hrs CST"

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