Editing a script to use with Acrobat

[DBookatay]

I found a JS $_GET script that extracts information from the url, like php does, but I need help editing it.

 

The first script is:

function jsGet(type){
if(location.href.match(type)){
return location.href.split(type+'=')[1].split('&')[0];
}}

document.write(jsGet('vin'));

 

In a .html page if the url is www.test.html?vin=354 the page displays "354" fine.

 

I am learning to create pdfs with Acrobat 9 and know that it supports javascript,but uses

event.value = something;

How can I edit the first script to display the "354" in a chosen field?

 

 

Did I explain myself properly?

[DBookatay]

Anyone?