How to merge pages using JavaScript

Hello, you are my last hope! I have the following problem: I have a "Master.pdf" and a "Slave.pdf" which are on the same HD and in the same folder. I now open the "Master.pdf" and in this "Master.pdf" there is a button which should run a java code. And this code should simple insert the pages from the "Slave.pdf" into the opened "Master.pdf". I handled this by choosing this button with the object tool, saying "properties" and set "Javascript" as action to run. I read the whole questions and answers on this side but i found nothing comparable. I tried snippets of some Java Code but it doesn't work.
 
My used snippets are as follows:
 
function MergeMultipleFiles()
{
var doc = app.newDoc();
vFiles = new Array("/C/TestPDF/First.pdf","/C/TestPDF/Second.pdf","/C/TestPDF/Third.pdf");
for ( var i=0; i < vFiles.length; i++)
{
doc.insertPages ({nPage: doc.numPages-2,cPath: vFiles,nStart: 0});
}
 
and I tried the simple code:
 
this.insertPages({cPath: "test1.pdf"})
 
But both doesn't work. Anyone could help? I need this automation for my company.