How to disable a form field?

You can assign multiple events to the onClick or onCHange (which is usually better for a drop-down).

Basically you just use javascript to change the status to disabled.

http://www.quirksmode.org/js/disabled.html

This is only part of what I need.

If "EV" from the drop down list is selected in the form, then the other drop down list "reasonout" needs to be disabled.
How can I do that?

Increasing points.

if(document.formname.dropdownname.options[document.formname.dropdownname.selectedIndex].value == "EV")
{   code to disable goes here   }

Mitch,

Could you be more specific of how to setup the code, where in relation to the form it goes, and how it works?
So, if this were my form where would I insert the code?

<form>
<select name=event>
<option value=EV>EV</option>
<option value=AT>AT</option>
</select>

<select name=reasonout>
<option value=EV>EV</option>
<option value=AT>AT</option>
</select>

Just trying to ask the correct question in order to understand your suggestion more fully.
Thanks

Who is mitch?  Do you have this question posted somwhere else as well?

sorry, i thought m stood for Mitch.

MRICHMON,

Sorry for calling you Mitch, it was an honest mistake.  

Could you be more specific of how to setup the code, where in relation to the form it goes, and how it works?
So, if this were my form where would I insert the code?

<form>
<select name=event>
<option value=EV>EV</option>
<option value=AT>AT</option>
</select>

<select name=reasonout>
<option value=EV>EV</option>
<option value=AT>AT</option>
</select>

Just trying to ask the correct question in order to understand your suggestion more fully.
Thanks

Is there a way to have two "onchange" events for the "event" drop-down select?

As I mentioned in my initial posting, this event drop-down already has an onchange event that populates a third drop-down list.

Any suggestions?

This works perfect.
Thanks.