If you don't have a Google account, make one first.
1. go to http://code.google.com/apis/maps/index.html 2. Click on "Sign up for a Google Maps API key" 3. Fill in your site, agree with the terms and click on the button "Generate API key" 4. Copy the example HTML code, paste in notepad and save as chooseaname.html
Now you have to make some changes in that HTML:
6. Change the bold data in "inmap.setCenter(new GLatLng(37.4419, -122.1419), 13)" by the coordinates you want to be centered on your map. (you can find these with p.e. Google Earth). 7. Change the height and width of the map in the last line of code. 8. Make a Iframe in DHE and link to your chooseaname.html (make the Iframe the same size as your map) 9. Upload to your server...it should work.