Including an external js file inside a js web resource

Hi,

Basically I want create a javascript file which contains some public functions and can be shared by my different javascript web resource. The problem is that js file is not like html file that you can have include file where you can refer an external javascript file. For example, I create a js file called myPublicJsLib.js and I want my other javascript web resource can use the functions defined in myPublicJsLib.js. How I can do this?

Thanks,

Lan