testLookup.page

<apex:page controller="testLookup">
    <apex:form >
    <apex:pageBlock id="incomeBlock" mode="edit">
        <apex:pageBlockSection columns="1">
            <apex:pageBlockTable value="{!opptys}" var="t">
                <apex:facet name="footer">
                </apex:facet>
                <apex:column headerValue="Id">
                  <apex:outputField value="{!t.Id}"/>
                </apex:column>
                <apex:column headerValue="Name">
                  <apex:inputField value="{!t.Name}"/>
                </apex:column>
                <apex:column headerValue="Account">
                  <apex:inputField value="{!t.AccountId}" required="false" onchange="actionChosen()"/>
                </apex:column>
            </apex:pageBlockTable>
        </apex:pageBlockSection>
    </apex:pageBlock>
      <apex:actionFunction name="actionChosen" reRender="incomeBlock">
      </apex:actionFunction>
    </apex:form>
</apex:page>