HELP!!!!! JSP and Java Script

Hi,
I have a JSP file that I need to create 3 drop lists (choice list). If one of these 3 choice lists is selected, then the other 2 need to deselected and disabled. I need help with the code.
Do I use JavaScript or Java? Below is the html code. I would really appreciate any help on this.
Thanks,
BK

<html>
<head><title>New Window Example</title>
<STYLE TYPE="text/css" >
td { font-size: 11px }
th { font-size: 11px }
body { background-color: #666666 }
</STYLE>
<SCRIPT>
/* When press CANCEL button, the dialog box disappears. */
     function Closer()
          window.close();
     function checkForm()
     var f = document.queryForm;
* Checks if an account number is entered. If not, an error message dialog pops up
* to the user.
* Checks if a business unit was chosen. If not, an error message dialog pops up
* to the user.
     buChoice = f.buList.selectedIndex;
          if (f.buList.options[buChoice].value == "")
               alert("Please choose a business unit.");
               f.buList.focus();
               f.toDate.select();
               return false;
     * This <code>statusMsg()</code>is to give the user feedback while data is being entered by
     * creating a status message. This script lets you modify what is displayed in this bar,
     * giving you the ability to send messages to the user while he interacts with filling out
     * the fields.Status Messages are the phrases you see in the status bar at the bottom of a
     * window or dialog.
     * For instance: For the account number text field, as long as the cursor is in this text
     * field of Account #, there's a message at the bottom of the dialog box informing, " Enter
     * only numeric characters."
     * @param msgType
     * @ mesage the data structure to store the messages sent to the users
     function statusMsg(msgType)
var message = "";
if (msgType == "integer")
message = "Enter numeric characters.";
if (msgType == "integerDate")
message = "between 1990 and 2010";
if (msgType == "ListBU")
message = "Choose which BU?";
if (msgType == "ListMonth")
message = "Choose a month."
window.defaultStatus = message;
window.status = message;
</script>
</head>
<body onFocus="statusMsg('')">
<FORM NAME= "queryForm" onSubmit = "return checkForm()" ACTION="Welcome.html">
<TABLE Border="0" cellspacing="2" cellpadding="4">
<TR>
<TD ALIGN=left>Company Code:</TD>
<TD WIDTH="20%"><SELECT Name=choiceMonths1 size=1 onFocus="statusMsg('ListMonth')">
<option value="" selected>
<OPTION Value="01">01
<OPTION Value="02"> 02
<OPTION Value="03"> 03
<OPTION Value="04"> 04
<OPTION Value="05"> 05
<OPTION Value="06"> 06
</SELECT></TD>
     <TR>
     <TD ALIGN=left>RegionID:</TD>
     <TD><select name=buList onFocus="statusMsg('ListBU')"> // onChange = "selectionMade()"
     <option value="" selected>
     <option value=Norht ALIGN="left">North
     <option value=East ALIGN="left">East
          <option value=South ALIGN="left">South
     <option value ALIGN="left">North</select></TD></TR>
<TR>
     <TD ALIGN=left>Business Unit ID:</TD>
     <TD><select name=buList onFocus="statusMsg('ListBU')"> // onChange = "selectionMade()"
     <option value="" selected>
     <option value=TBR ALIGN="left">TBR
     <option value=BAL ALIGN="left">BAL
     <option value ALIGN="left">ABH</select></TD></TR>
</TR></TABLE>
<TABLE>
<tr>
<TD><INPUT TYPE=submit Value=Submit></TD>
<TD><INPUT TYPE=button NAME=btnClose VALUE=Cancel SIZE=20 ALIGN= center onClick="Closer()"></TD>
     <TD><input type=reset VALUE= Clear Query SIZE=20 ALIGN= right></TD></TR></TABLE>
</FORM>
</BODY>
</html>

What i've done in the past in this same situation is to use radio buttons alongside my dropdown lists. Whenever a radio button is selected, the corresponding dropdown list is enabled, and the other lists are all disabled. Not too hard to implement in Javascript either. Use an onClick() and set the other fields to disabled, using document.form.field.disabled = true. (and obviously, set the one you want to disabled = false). But obviously, you're still going to want to know which one to retrieve later, right? Use a hidden tag and in the same Javascript onClick, you can dynamically set the variable to whatever you want. Here's a pretty compact example using 2 fields
function enable(field)
     if(field == "firstName")
          document.myForm.firstName.disabled = false;
          document.myForm.lastName.disabled = true;
          document.myForm.searchBy.value = "firstName"
     else
          document.myForm.firstName.disabled = true;
          document.myForm.lastName.disabled = false;
          document.myForm.searchBy.value = "lastName"
}Or something like that. Yeah, I know it's not the greatest javascript in the world, but i was just simplifying things to give an example. Hope this helps somewhat :)
Simon

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