Using Prototype.js in JDeveloper

Hi All,
I'm attempting to learn more about AJAX and was going over the examples int he book AJAX in Oracle JDeveloper. In chapter 3 I ran into a snag. It looks like the prototype.js functions are not being reached from within my input.js file. The same function is being called from an input component but when I put an alert() call in the called function I get nothing. I have enabled debugging via the xml files in the project. The same alert works in the old code.
I've added prototype.js as a script tag in my jsp file. Is the order significant?
Is there something special I have to configure to get prototype.js to work. I simply added it to the projects public_html folder and add the script tag.
TIA,
Dave

Turns out that the author referenced xmlHttpRequest instead of XMLHttpRequest in his example.

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