</script>

      <apex:actionFunction name="show" action="{!search1}" reRender="None">
      <apex:param name="show1" assignTo="{!contactids}" value=""/>
 </apex:actionFunction>


        <apex:actionFunction name="showRiskFactors" action="{!search}" reRender="oid" status="status"/>
    <apex:pageMessages />
        <apex:pageBlock >
            <apex:outputlabel value="Event"/>
                <apex:selectList value="{!ownership}" size="1"  style="width: 200px;"  onchange="showRiskFactors();">
                    <apex:selectOptions value="{!ownershipOptions}"/>
               </apex:selectList>
                <apex:commandButton value="search" action="{!search}" rerender="oid"  status="status"/>
            <apex:actionStatus id="status" >
            <apex:facet name="start" >
                <div style="width: 500px;">
              <img src="/img/loading.gif" />
              </div>
            </apex:facet>
        </apex:actionStatus>
        </apex:pageBlock>

          <apex:pageblock id="oid" >

      <apex:pageblocktable value="{!conlist}" var="con" >
        <apex:column style="width:5%;">

                <apex:inputCheckbox onchange="show('{!con.id}'); return false;"/>
              </apex:column>
          <apex:column headerValue="Name" value="{!con.name}"/>
          <apex:column headerValue="Event" value="{!con.event__c}"/>

</apex:pageblocktable>
 <apex:pageBlockButtons location="bottom">
             <apex:commandButton value="Select" onclick="goInside(); return false;" style="width:60px;"/>
             <apex:commandButton value="Cancel" onclick="window.top.parent.close();" style="width:60px;"/>
         </apex:pageBlockButtons>
         <apex:pageBlockTable value="{!string1}" var="s">


         </apex:pageBlockTable>
    </apex:pageBlock>

</apex:form>

system.debug('--set1--'+set1);

    }

public librtyasiaproject1()
{
set1=new set<string>();
    conlist=new list<contact>();
      conlist=[select id,name,event__c from contact where event__c!=null];
}

public List<SelectOption> getownershipOptions()
{
    List<SelectOption> options =  new List<SelectOption>();
    options.add(new selectOption('None','--- None ---'));
    Schema.DescribeFieldResult fieldResult =  contact.event__c.getDescribe();
    List<Schema.picklistEntry> ple = fieldResult.getPicklistValues();
    for(Schema.picklistEntry f:ple)
    {
        options.add(new selectOption(f.getLabel(),f.getValue()));
    }
    return Options;
}

  public void search() {
  conlist=new list<contact>();
    conlist=[select id,name,event__c from contact where event__c=:ownership ];
    system.debug('---conlist-->'+conlist);

}