Calling a function inside a Library Script File, from a Client Script

Hello,

I have created a Client Script in which there is a funtion called: requestCard. The first lines of this function are:

function requestCard(){

    var message = validateLib();
    alert(message);

...

}

the function "validateLib(); is in a .js file like the following:

/***********/

function validateLib(){
return "hello";
}

/****************/


I have attached that file in the client script (as a Library Script File). When I call the function "requestCard" I´m not getting the alert message that it was supposed to appear on my screen.

I would like to know what I am doing wrong.

Thanks in advance,
regards.