Set a window.onload = functionName; or use the jQuery .ready() to contain the code.
Get the value of the textbox.
Split the value using / as the delimiter.
Leave the date as is; set up a switch/case to change the second to the full name (ie case 1: "January", case 2: "February", etc.); add 2000 to the year.
Repopulate the textbox with the new value.
If anyone knows of a website that can offer ColdFusion help that isn't controlled by neurotic, pedantic jerks* (stackoverflow.com), please PM me with a link.
* The neurotic, pedantic jerks are not the owners; just the people who are in control of the "popularity contest".