Okay this is what i have managed and if anyone is interested in putting a link to a map using info created in a field called postcode/zipcode, it will display that info in this form, which i have personally cut down to just the postcode and the button for my own purposes, but if you want the whole one here it is.
<!-- MapQuest Start -->
</FORM>
<form action="http://www.mapquest.co.uk/mq/maps/linkToMap.do" method="post">
<input type="hidden" name="CID" value="lfmapwid">
</form></TD>
<TD width="50%">
<FORM action="http://www.mapquest.co.uk/mq/maps/linkToMap.do" method=post name=linktomap>
<DIV align=center>
<TABLE style="FONT: 11px Arial,Helvetica" cellSpacing=0
cellPadding=3 border=0>
<TBODY>
<TR>
<TD colSpan=2>
<DIV align=center><a href="http://www.mapquest.co.uk/mq/home.do">
<img border="0" src="http://cdn.mapquest.com/mqstyleguide/ws_wt_sm" alt="MapQuest"></A></DIV></TD></TR>
<TR>
<TD colSpan=2>Address/Junction:</TD></TR>
<TR>
<TD colSpan=2><INPUT maxLength=80 name=address> </TD></TR>
<TR>
<TD colSpan=2>Location:</TD></TR>
<TR>
<TD colSpan=2>
<INPUT type="text" maxLength=80 name=city value="{$link.location}" size="20"> </TD></TR>
<TR>
<TD>Post Code:</TD></TR>
<TR>
<TD>
<input type="text" maxLength=12 size=10 name=Postcode value="{$link.postcode}"> </TD></TR>
<TR>
<TD colSpan=2>Country:</TD></TR>
<TR>
<TD colSpan=2><SELECT name=country>
<option value=AT > Austria </option>
<option value=BE > Belgium </option>
<option value=DK > Denmark </option>
<option value=FR > France </option>
<option value=DE > Germany </option>
<option value=IT > Italy </option>
<option value=LU > Luxembourg </option>
<option value=NL > Netherlands </option>
<option value=ES > Spain </option>
<option value=SE > Sweden </option>
<option value=CH > Switzerland </option>
<option value="GB" selected>United Kingdom</option>
</SELECT> </TD>
</TR>
<TR>
<TD style="TEXT-ALIGN: center" colSpan=2><INPUT type=submit value="Get Map">
</TD></TR></TBODY></TABLE></DIV></FORM><!-- MapQuest End -->
Of course the above is for UK and Europe Only. For US (other parts of world maybe available you will have to look) use this one here http://www.mapquest.com/features/main.adp?page=lf_findit and you maybe able to change the option codes to make a drop down of your choice. But that might be fiddly.
Lastly if you want to change the country which is displayed first in my case UK. Which is like this:
<option value="GB" selected> United Kingdom</option>
If i wanted France to be highlighted first i would change:
<option value=FR >France</option> to:
<option value="FR" selected>France</option>
One last tip..i couldn't get the code on the MapQuest Site to work straight off, in fact all it displayed was the country. The Above is the result of fiddling with their source code of their demo and their code to put in your page, so bare that in mind if you don't get it to work for the US one.