http://api.drupal.org/api/function/field_info_field/7
field_info_field('field_name') returns an object or NULL.
field_info_field('field_name')
So you've custom themed a search bar into your brand spanking new custom theme using my handy tutorial covering that topic (http://www.agaricdesign.com/note/theme-search-form-drupal-6)
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