Can't access a value stored in a form text field

I created a small test page to try and understand how a piece of javascript works, well actually it's not working. All I'm trying to do is display the value entered in a text field in a form and it's failing with 
SCRIPT5007: Unable to get value of the property 'value': object is null or undefined 
temp.php, line 39 character 1
The line it's failing on is this
x = document.getElementById("otherChoice").value;
The page can be seen here www.hollisterairshow.com/temp.php
I just don't understand why it thinks the text field is undefined when it clearly is. I'm using DW CS4 and IE9.
Thanks for any pointers you might have.
Tony

Thank you so much, I've been struggling with this for almost a week now.
Just to complete the answer, I had to assign an ID to the text field and also to the "Other" button so that the JS could access both when it moved the value from the text field to the Button which was the original problem I was trying to solve.
Thanks again for the assistance, much appreciated.
Tony

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