JavaScript in Default Template

Hi,
I need to put a js in between the head tags in wp default theme template. I opened up header.php

and place the script in between,

<?php wp_head(); ?>

</head>

is this correct? or am I suppose to put the script in the index.php page within the template? in the wp-content/themes/default/index.php

i tried putting the script underneath <?php get_header(); ?>, but no avail

what am I doing wrong? thanks

i want the js to execute upon the home page of my blog or any of its posts.