Input lookup field on SF1

Hi all,

As a noob I'm probably missing something but we have a Contact standard controller extension page which has the following section of code :-

<apex:pageBlockSectionItem >
                   <apex:outputLabel value="To Company" for="targetContact"/>
                   <apex:inputField value="{!targetContact.AccountId}" id="targetContact" onchange="reRenderForm();"/>
               </apex:pageBlockSectionItem>

The inputField uses the standard contact.Account lookup field & automatically causes a search button to appear on the VF page. However when viewed through SF1 clicking the search button causes a browser page to be opened & the user is asked to login. Can anybody suggest a way of keeping this process within SF1?

Thanks in advance for any help,

Stickleback