Error: Object doesn't support this property or method

I was wondering for quite a while when I hit a javascript error. It stated "Error: Object doesn't support this property or method". The error was in this function, the line which has the word action:

function InsertRecord(){

var myForm = document.form1;

myForm.action="xxxxxxxxxxxx";
myForm.submit();
}

Lucky for me, my sifu, Steven, helped me out on this. My problem was actually a simple and silly error. What I done wrong was:

<button name="action" value="Attachment">

I have actually define one of my button in the form with the name of "action". After changing the name to a more meaningful one, it works once again. :-)