Hi to all say i have the following

PHP Code:
<script  language="JavaScript" src="js/page.js" type="text/javascript"></script> 
how could i load the src dynamically through another function or whatever.I want to do that cuase is not nessecary to load page.js all the time and i do not want to cause is a 300k page so i want to set a var to load it any time i want any help appreciated

thnks