Updating a field that generates random number when form is reset..

I have a field that will generate a random number when the form is initially opened. THis fiekd runs an initialization script of : var randomnumber=Math.floor(math.random()*99999) and then a calculation script of randomnumber.
The field value is set as Calculated - Read Only.
When I hit the Reset button and it clears all the input fields for the form i would like to have it re calculate a new random number. I am not knowledgable in any scripting language and what I have so far I found by searching the forums.
Any help would be appreciated.
Thanks

I don't know if it should matter, but the field to update is on a page other than the one with the reset button. And, the above is not working.
I tried it as you stated above fieldname.rawvalue=randomnumber and I tried pagename.fieldname.rawvalue=randomnumber

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