How can i call external js file in aspx page which contains the master page

Question

Hi I have a problem..
    
         Iam facing a problem when i want to make validations in clientside.I want to place all javscript client side validations in seperate file and access it from aspx page..how can it is possible.plz help me

I tried to call the external javscript file like this

<script type="text/javascript" src="js/validations.js"></script>