How can I use script library file?

Hi all,

I don't know how to use script libray file and I put all of the functions on one main file. Can someone do a simple demo of how to use library files?
Is is like the following?

Are arguments in the calling function passed to the functions in the library files?



========================================
//mian file: main.js
function main()
{
     subFunctionOne(para1, para2);
}


//library file: libOne.js
function subFunctionOne(para1, para2)
{

}