Setting URL for Dynamic Lookup page using Dynamic Component

<apex:page controller="DynamicLookupClass1">

<apex:form >

<apex:pageBlock >

 <apex:pageBlockSection id="section" title="Send To" >

<apex:selectList size="1"  value="{!lookupType}" >

    <apex:actionSupport event="onchange" rerender="lookupSection" action="{!changeLookupType}" status="lookupStatus"/>  

    <apex:selectOption itemValue="Contact"/>

    <apex:selectOption itemValue="Opportunity"/>  

</apex:selectList>

</apex:pageBlockSection>

<apex:actionstatus id="lookupStatus" onstart="alert('HI')" onstop="alert('End')"/>

<apex:outputpanel id="lookupSection">

      <apex:dynamicComponent id="dynCom" componentValue="{!myFieldSetSection}"/>

</apex:outputpanel>

</apex:pageBlock>

</apex:form>

</apex:page>

public class DynamicLookupClass1 {

     

      public DynamicLookup__c lkp {get; set;}

    public String lookupType { get; set; }     

    public Component.Apex.pageBlockSection getMyFieldSetSection() {       

         Component.Apex.pageBlockSection rTag = new Component.Apex.pageBlockSection();      

         Component.Apex.inputField oppTotal = new Component.Apex.inputField();

         if(lookupType == 'Opportunity')

         oppTotal.expressions.value='{!lkp.Opportunity__c}';

         else if(lookupType == 'Contact')

         oppTotal.expressions.value='{!lkp.Contact__c}';

         else

         oppTotal.expressions.value='{!lkp.Opportunity__c}';        

         rTag.childComponents.add(oppTotal);

         return rTag;

    }

   

    public void changeLookupType(){            

    }   

}