Please help with variable please and show how clever you are.

Please help with variable please and show how clever you are.

Hi,

Simple scenario...

Form A

Form B

If you run form A an alert comes up saying "You have run form A"

If you open form A from form B, I want the alert to say "You run form A from form B"

In simple terms the code should be

When in form A make a variable called, lets say,  xxa=1 and carry it over to form B

when in form B say

(if xxa=1 then

alert  "You run form A from form B"

else

alert "You have run form A")

Could one of you clever people show me the correct script for this problem

Thanks in advance

Nigel