If you try to add javascript within a node field and it gets stripped out - even when using the 'PHP code' text format - check out the drupal_add_js function.
Commonly used in modules, it can also be used in content fields too. Just make sure you are entering the code in a field that is using the 'PHP code' text format.
Here are some examples:
<?php // This will add a JS file to your head (specifically the $scripts variable in page.tpl.php) drupal_add_js(drupal_get_path('module', 'my_module') . '/my_module.js'); // This add inline JS to the head of the document drupal_add_js('alert("Hello!")', 'inline'); // This will add variables in the Drupal.settings object drupal_add_js(array('my_module' => array('my_setting' => 'this_value')), 'setting'); ?>
For more info check out the function drupal_add_js API page (where these examples are lifted from).
Drupal version:

Justin Chevallier
Avid Drupal site builder & user for +10 years.
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