No result however, code seems to be messed up and no map is shown. It becomes the following: <a style="color: #0000ff; text-align: left" href="http://maps.google.be/maps?f=q&source=embed&hl=nl&geocode=&q=grote+markt+antw erpen+2000&sll=51.08583,4.363773&sspn=0.01023,0.019312&g=grote+markt+antwerpen&ie=UTF8&a mp;amp;ll=51.227958,4.404488&spn=0.0051,0.009656&z=14">Grotere kaart weergeven</a>
Result : on the webpage there is only some code, no map.
I use tinymce also for another cms, and no problem to paste html codes or google map iframes..?
If you want to have the maps only in 1 page, try to put it into a specialized template for that page. Then select the template for the given page in admin.