Have a look at the jQuery plugin JavaScriptSpellCheck
http://www.javascriptspellcheck.com/jquery-spell-check/
Looks like it's as simple as including the base jQuery library along with the plugin code. Add the JavascriptSpellCheck plugin after jQuery:
<script src="/js/jquery.min.js"></script>
<script src="include.js"></script>
If it were me, I would rename that include.js to something like jquery-JavaScriptSpellCheck.js (or use another plugin).
With this plugin you can "capture" or create the event which triggers the mispellings. Just a quick glance at the plugin docs, I see a few live demos, namely this one:
http://www.javascriptspellcheck.com/JavaScript_Spell_Check_Function_Demo
Hope this helps.