It's no template code
Open: your theme/details.html
Find {image}
Add before (or after)
{if google_id}<embed style="width:400px; height:326px;" id="VideoPlayback" align="middle" type="application/x-shockwave-flash" src="http://video.google.com/googleplayer.swf?docId=-{google_id}" allowScriptAccess="sameDomain" quality="best" bgcolor="#ffffff" scale="noScale" salign="TL" FlashVars="playerMode=embedded"> </embed>{endif google_id}
add:
google_id to your 4images_images (mysql)
Add:
$additional_image_fields['google_id'] = array($lang['google_video'], "text", 0);
to db_field_definitions.php
Now upload this image
http://www.bran.dk/google_video.gif (right click save as) to your 4image site.
When you have done that. Click edit image and add the google ID video in the last field. Click save check if it is working.
You can add some text to your language file, so it says what the field is when you edit the image.
And you could propely also add something to the upload template so you don't have to add the ID via edit.