[help] onclick function in IE?

I have a drop down list on my page and for each value, when you click on it, it will display that value in a text box.

basically the code is like this:

<form action='save_info.php' method='post'>
<select name='ch1' >
<option value='Small' onclick="document.form2.info_box.value='Small' ">Small
<option value='Medium' onclick="document.form2.info_box.value='Medium' ">Medium
<option value='Large' onclick="document.form2.info_box.value='Large' "> Large
</select>
</form>


<form name = 'form2'>

<input type='text' name='info_box'>

</form> 

So if the user selects “small” from the drop down list it will also show small in the text box. This works perfectly in Firefox. But doesn’t seem to work in IE.
Am I doing something wrong?

I would really appreciate some help.