salesforce - Expanded lookup in Tasks for a custom object in Visualforce -


i'm new @ this, appreciate help. trying create expanded lookup field activities (tasks) page since in visualforce. want lookup custom object called telemarketers.

here's have far , can't seem make work!

<apex:page standardcontroller="task">   <apex:form >     <apex:inputfield value="{!task.telemarketer.name_c}"/>   </apex:form> </apex:page>

i've tried changing {!task.telemarketer.name_c} other things keep getting errors " invalid field telemarketer sobject task" "could not resolve field 'telemarketername_c' value binding '{!task.telemarketername_c}' in page sample1 " "could not resolve field 'telemarketername' value binding '{!task.telemarketername}' in page sample1 "

help please!! im going crazy

following observations

1) not sure if using id on apex page url should - https://c.ap1.visual.force.com/apex/test?id=00t90000010utkc id required since trying input field of particular record.

2) regarding field names, please select api name of field in visualforce page.

eg. code here 

<apex:page standardcontroller="task">   <apex:form >     <apex:pageblock title="my content" mode="edit">        <apex:pageblocksection title="my content section" columns="2">          <apex:inputfield value="{!task.status}"/>          <apex:inputfield value="{!task.whoid}"/>       </apex:pageblocksection>     </apex:pageblock>   </apex:form> </apex:page>

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