Yes, Russell the great pulls through again with yet another clever 
little circuit.  However a single pole relay will not work and you would 
need a DPDT relay (although probally not a problem).  One set of 
contacts for the toggleing function and one set of contacts for your load.

M. Adam Davis wrote:

> I've been looking for/thinking about a single relay toggle switch 
> forever, but this is brilliant!  I guess I can stop looking.
>
> -Adam
>
> Russell McMahon wrote:
>
>>>> I need to turn ON or OFF a small 12V d.c. motor using a micro-switch,
>>>>     
>>>
>>> but the requirement is, the micro-switch must be operating like a 
>>> toggle
>>> switch,
>>>   
>>
>>
>>
>> For a touch of brilliance
>>
>>        http://www.oldradio.com/current/pushon-pushoff.htm
>>
>> Same circuit drawn more tidily (actually slightly harder to follow)
>>
>>        http://beradio.com/news/radio_pushonpushoff_switch_2/
>>
>> ________________________________
>>
>> Others:
>>
>> Daniel's idea of buying a switch this has this function built in
>> mechanically sounds like a good idea.
>>
>> My idea of a JK flip flop and IE's equivalent of a D is a good simple
>> electronic implementation
>>
>>        RM
>>
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>>  
>>
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