$("#dialog").dialog({
 	bgiframe: true,
 	autoOpen: false,
 	height: 300,
 	modal: true,
 	buttons: {
 		'Select User': function() {
 			//	$('.primary_fname').val('Test');
 			//	$(this).dialog('close');
 			$('#search').ajaxForm({target:'#search_results'});
 		},
 		Cancel: function() {
 			$(this).dialog('close');
 		}
 	},
 	close: function() {
 	}
});


<div id="dialog" title="Search">

  <% form_tag({:action => 'search', :controller => 'people'}, :id => 'search',:method => 'get') do %>
       <%= text_field_tag :search, h(params[:search]), {:autocomplete => 'off', :class => 'search',:size => 26} %>
       <input type="image" src="/images/buttons/update.gif" name="image" class="button" title="Update" />
  <% end %>

  <div id="search_results" style="margin:1em 0;"> </div>

</div>