<form name="mzs" "onSubmit='return false;'">
<select name="container" onChange="document.mzs.amt.value=document.mzs.cont ainer.value">

<option value="">-Container-</option>
<option value="$228.34">1 gallon</option>
<option value="$57.08">32oz</option>
<option value="$28.54">16oz</option>
<option value="$21.41">12 oz</option>
<option value="$14.27">8oz</option>
</select>
<span class="header"> &nbsp;&nbsp;Result:</span>
<b><input type="text" name="amt" size="7" class="sidetext" style="background-color:#FFF;"></b><br />



</form>

This also works on all browsers except IE.

Don't worry. Your script works fine in my IE.
Look's like you have to allow dynamic content in your IE

How do you guarentee that the user will allow dynamic content in their browser?

As I know IE required such confirmation for local scripts only.
If it's online page- then confirmation is not required