NaN & concatenate???

I'm printing a table to the screen with x number of rows. As each row is put out, I update form objects by appending the value of x to them. For example (rough):

x=1
do while....
<input type=text name="Test & <%=x%>">
x = x+1
next

When I click on a form object, I call a function in which I pass the value of x. I then want concatenate x with the name of the form object. For example:

function testMe(x)

var s = (document.form.Test+x)

But each time I get NaN as the form object. What am I doing wrong? Thanks!

the variable x is being cast as a string.
put some of these in your script to find out where it's changing type: