Copy value from pop-up to main window

Here is a simple XHTML page that opens a pop-up when you click on the text box. You can then select a value from the drop down list and it will be copied to the text box you just clicked.
Nothing fancy or advanced. Just something I wrote because I was bored and somebody on some forum asked how to do this.

Oh and a happy x-mas. I hope yours is better than mine...