undefined function libraries_load

Accepted with little changes, thanks a lot.

This is a curiosity question more than anything else.

I, too, was getting the "call to undefined function" error when I tried to load a library in a module that I have developed. The problem occurred when I tried to execute the libraries_load function at the top of my module [i.e. outside all of the functions], but worked fine when I put it within a function. Can somebody tell me why?

This fails:
<?php
libraries_load('somelibrary'); //Generates "call to undefined function error

function1(){
...
}

function2(){
...
}

But this succeeds:
<?php
function1(){
libraries_load('somelibrary');
...
}
function2(){ . //Doesn't need 'somelibrary'
...
}