Linking two drop down list together

I have two drop downs list and I need to link them together for the user to only answer one of them and it won't allow an answer in the other or vice versa. How can I set that up?
If answer drop down list A then can't answer drop down list B
else
if drop down list B is answered then drop down list A can't be answered.

The attached contains two drop-down lists - apples and oranges. Each drop-down list has a default list item value of " ", thus the default index is 0 (zero). If you select a value other than default, the other drop-down list has it's access protected and the list item reset to 0 (zero). Conversely, if you select the default value, the other drop-down list becomes open or accessible.
// form1.page1.apples::exit - (JavaScript, client)
if (form1.page1.apples.selectedIndex != 0) {
form1.page1.oranges.access = "protected";
form1.page1.oranges.selectedIndex = 0;
else {
form1.page1.oranges.access = "open";
// form1.page1.oranges::exit - (JavaScript, client)
if (form1.page1.oranges.selectedIndex != 0) {
form1.page1.apples.access = "protected";
form1.page1.apples.selectedIndex = 0;
else {
form1.page1.apples.access = "open";
Steve

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Hi,
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<select name="gameselect">
<%
try
String year = "2009";
String connectionURL = "jdbc:mysql://localhost:3306/ElmwoodExpos";
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection(connectionURL, "root", "thejedster");
String sql = "SELECT GameId, GameDescription FROM Games WHERE Year = " + year;
Statement s = con.createStatement();
s.executeQuery(sql);
ResultSet rs = s.getResultSet();
while(rs.next())
%>
<option value="1"><% out.print(rs.getString("GameDescription"));%></option>
<%
catch(Exception e)
%>
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Jed

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HI!
hopefully somebody can help me.
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Message was edited by:
Mike Khatib

Hello Mike,
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If you need further information dont hesitate to ask me!
Best regards
Johannes
PS: Please assign points if this information was helpful

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Hi,
I would recommend some posts from Stefan Cameron's blog:
http://forms.stefcameron.com/2006/09/18/connecting-a-form-to-a-database/
http://forms.stefcameron.com/2006/09/29/selecting-specific-database-records/
http://forms.stefcameron.com/2006/12/18/databases-inserting-updating-and-deleting-records/
http://forms.stefcameron.com/2006/12/07/better-form-design-with-xfa-25/
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Check out this Coordinated Dropdown Sample Application :
http://developers.sun.com/prodtech/javatools/jscreator/reference/code/sampleapps/2/2update1/CoordinatedDropDowns.zip
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Linking two drop down list together

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