Hello
I am somewhat new to VF/Apex and I've created a dependent picklist to use in Visualforce. Everything saves fine. When I go to preview, the first picklist appears correctly but the second one does not re-render once the first option is chosen. I am not sure what I am doing wrong. I have searched many boards/blogs etc and tried a couple different things. Any advice would be greatly appreciated. There are actually tons more options in my lists but I figured no one needed to see all of those to understand the issue.

Here is the VF:

<apex:page id="communitiesSelfRegPage" showHeader="true" controller="CommunitiesSelfRegController" title="{!$Label.site.user_registration}">
     <apex:define name="body">  
      <center>
<apex:form id="theForm" forceSSL="true">
                    <apex:pageMessages id="error"/>
                    <apex:panelGrid columns="2" style="margin-top:1em;">
                      <apex:outputLabel value="First Name" for="firstName"/>
                      <apex:inputText required="true" id="firstName" value="{!firstName}" label="First Name"/>
                      <apex:outputLabel value="Last Name" for="lastName"/>
                      <apex:inputText required="true" id="lastName" value="{!lastName}" label="Last Name"/>
                      <apex:outputLabel value="{!$Label.site.community_nickname}" for="communityNickname"/>
                      <apex:inputText required="true" id="communityNickname" value="{!communityNickname}" label="{!$Label.site.community_nickname}"/>
                      <apex:outputLabel value="{!$Label.site.email}" for="email"/>
                      <apex:inputText required="true" id="email" value="{!email}" label="{!$Label.site.email}"/>
                      <apex:outputLabel value="Location" for="Location"/>
                      <apex:selectList value="{!location}" title="Location" multiselect="false" size="3" >
                          <apex:selectOption itemValue="Aerospace Elementary" itemLabel="Aerospace Elementary School"/>
                          <apex:selectOption itemValue="108 Charter Oak" itemLabel="108 Charter Oak"/>
                          <apex:actionSupport event="onchange" reRender="one"/>
                        </apex:selectList>
                        <br/>
                      <apex:outputPanel id="one">
                          <b>Choose a Customer Organization</b>
                          <apex:selectList size="1" value="{!customerOrganization}">
                              <apex:selectOptions value="{!customerOrganization}"/>
                          </apex:selectList>
                        </apex:outputPanel>
                      <apex:outputLabel value="{!$Label.site.password}" for="password"/>
                      <apex:inputSecret id="password" value="{!password}"/>
                      <apex:outputLabel value="{!$Label.site.confirm_password}" for="confirmPassword"/>
                      <apex:inputSecret id="confirmPassword" value="{!confirmPassword}"/>
                      <apex:outputText value=""/>
                      <apex:commandButton action="{!registerUser}" value="{!$Label.site.submit}" id="submit"/>
                    </apex:panelGrid> 
                  <br/>
</apex:form>
     </center>
      <br/>
    </apex:define>

</apex:page>

Here is the controller (at least the relevant part):

public with sharing class CommunitiesSelfRegController {

    public String firstName {get; set;}
    public String lastName {get; set;}
    public String email {get; set;}
    public String phone {get; set;}
    public String password {get; set {password = value == null ? value : value.trim(); } }
    public String confirmPassword {get; set { confirmPassword = value == null ? value : value.trim(); } }
    public String communityNickname {get; set { communityNickname = value == null ? value : value.trim(); } }
    public String location {get; set;}
    public String customerOrganization{get;set;}
  
    
    public CommunitiesSelfRegController() {}
    
    public List<SelectOption> getCustomerOrg(){
        List<SelectOption> locs= new List<SelectOption>();
        if(location==null)
            return null;
        else
        {
            if(location.contains('Aerospace Elementary School')){
                locs.add(new SelectOption('Aerospace Elementary School','Aerospace Elementary School'));
                locs.add(new SelectOption('Other','Other'));
            }
            if(location.contains('108 Charter Oak')){
                locs.add(new SelectOption('Student Services', 'Student Services'));
                locs.add(new SelectOption('Other','Other'));
            }
           
                  }
        return locs;
    }