HI All,

       I have created  one vf page  to dispaly questions(records) from my custom object  and  provide result  for the questions  in same vf page.  Now  my senarios . I need to set time  for vf page. like supoose in  my vf page there are 20 questions. for 20 questions ineed to set 20 min time  . If end user could n't complete the test  with in 20 mins , that question should not appear automatically,   i am placing my vf page and controller, plz suggest me to set time    and how to implement this  senario.

vf page:

-------------

<apex:page controller="Records20" sidebar="false" >
<apex:form >
<apex:outputpanel rendered="{!displayRecords}" >

<apex:pageblock Title="Answers the Questions">

<b><apex:outputText value="Your Time Starts Now: {!Timer}:00 Min" id="counter"/></b>
<apex:actionPoller action="{!incrementCounter}" rerender="counter ,button" interval="15"/>
<br/>
<br/>

<apex:pageBlockButtons location="bottom">

<apex:commandButton value="Submit" action="{!saveAnswer}" id="button"/><br/>
</apex:pageBlockButtons>
<apex:repeat value="{!items1}" var="it">
<apex:outputText value="{!it.intSerial}"> </apex:outputText>).&nbsp;<apex:outputText value="{!it.strQuestion}"></apex:outputText>
<apex:SelectRadio value="{!it.answer12}">
<apex:selectoptions value="{!it.itemsWrap}"/>
</apex:SelectRadio><br/>
</apex:repeat>
</apex:pageblock>
</apex:outputpanel>
YOUR RESULT IS:&nbsp;&nbsp;<apex:outputText value="{!intCount}"></apex:outputText>
</apex:form>
</apex:page>

__________

controlle---

public class Records20{

public Integer Timer;
public boolean displayRecords{set;get;}
public string answer1{set;get;}
public List<selectOption> selItems {get;set;}
public integer intCount{get;set;}
list<wrapperQuestions> objwraplst = new list<wrapperQuestions>();
list<Questiuons__c> ques=new list<Questiuons__c>();


public Records20()
{
Timer=0;
displayRecords=true;
list <Questiuons__c> ret=[SELECT id,Question__c,Answers__c,Correctanswer__c FROM Questiuons__c LIMIT 20 ];
ret = ObjectRandomizer.randomizeList (ret);
integer serial=0;
for(Questiuons__c a :ret )
{
System.debug('aaa'+a);
String s = a.Answers__c;
list<string> st =s.split(',');
wrapperQuestions objWrap = new wrapperQuestions();
objWrap.strQuestion = a.Question__c;
objWrap.correctAnswer=a.Correctanswer__c;
serial=serial+1;
objWrap.intSerial=serial;
selItems = new List<selectOption>();
for(String str:st)
{
selItems.add(new SelectOption(str,str));

objWrap.itemsWrap=selItems;

}

objwraplst.add(objWrap);

}
}

public void saveAnswer()
{
intCount=0;
for(wrapperQuestions objwrap:objwraplst)
{
system.debug('::::::::::::'+objwrap.answer12);
if(objwrap.answer12==objwrap.correctAnswer)
{
//intCount = intCount+1;
intCount++;
displayRecords=false;

}else 
displayRecords=false;
}

}

public PageReference incrementCounter() {
if(Timer<=5)
Timer++;
system.debug('@@@@@@@@@@@'+timer);
return null;
}

public Integer getTimer() {
system.debug('!!!!!!!!!!!!!!'+timer);
return Timer;
}
public list<wrapperQuestions> getitems1()
{
return objwraplst;
}


public class wrapperQuestions
{
public string strQuestion{get;set;}
public integer intSerial{get;set;}
public List<selectOption> itemsWrap {get;set;}
public string answer12{set;get;}
public string correctAnswer{set;get;}

}

}

  Any one can help me