[Cborrow]

Well you can get the name and value of the selected dropdown like so, I believe.

var selectedItem = document.forms[0].selectName.options['document.forms[0].selectName.options.selectedIndex];
var name = selectedItem.getAttribute('name');
var value = selectedItem.value;

then to add it to a textbox

document.forms[0].textBoxName.value = str;

I think that might work.

You can replace forms[0] with your form name and selectName and textBoxName are the names of the select and textbox

e.g.

<input type="text" name="textBoxName" />
<select name="selectName">
</select>