Hi,

design\standard\templates\content\datatype\edit\ezobjectrelationlist.tpl:
line 190:
<div id='{$attribute.id}_create_new_object' style="display:none;">

line 195
onclick="var divfield=document.getElementById('{$attribute.id}_create_new_object');divfield.style.display='block';

The id of a tag must not start with a number.

Fix:
<div id='create_new_object_{$attribute.id}' style="display:none;">

and
onclick="var divfield=document.getElementById('create_new_object_{$attribute.id}');divfield.style.display='block';

References:

• W3C spec: http://www.w3.org/TR/html4/types.html#h-6.2
• Tags definitions: http://www.w3.org/TR/html4/index/elements.html

Best wishes,
Georg.