lint_to_remote for image

I have some simple code so that when you click on a thumbnail,
it's supposed to display the image enlarged in the enlargement area.
The page looks right, but when you click on a thumb nothing happens, it
just moves up the page. Why is the href=# happening ? The generated
html comes after the sample rhtml

<%= image_tag @enlargement, :width => "279", :height => "200" %>

    <% @images.each do |img|%>
    <% itag = "#{img[:thumb_path]}" %>
    <% puts "HR: #{itag}" %>
    <%= link_to_remote image_tag ("#{itag}"),
                          {:update => "enlargement",
                           :url => {:controller => "reunion", :action
=> "enlargement", :id => 0}
                           }
         %>
<% end %>

    <a href="#" onclick="new Ajax.Updater('enlargement',
'/reunion/enlargement/0', {asynchronous:true, evalScripts:true});
return false;"><img alt="Thumb_4094"
src="/images/admin/content/home/pages/thumb_4094.jpg?1165028402" /></a>

    <a href="#" onclick="new Ajax.Updater('enlargement',
'/reunion/enlargement/0', {asynchronous:true, evalScripts:true});
return false;"><img alt="Thumb_4095"
src="/images/admin/content/home/pages/thumb_4095.jpg?1165028402" /></a>

    <a href="#" onclick="new Ajax.Updater('enlargement',
'/reunion/enlargement/0', {asynchronous:true, evalScripts:true});
return false;"><img alt="Thumb_4096"
src="/images/admin/content/home/pages/thumb_4096.jpg?1165028402" /></a>

    <a href="#" onclick="new Ajax.Updater('enlargement',
'/reunion/enlargement/0', {asynchronous:true, evalScripts:true});
return false;"><img alt="Thumb_4097"
src="/images/admin/content/home/pages/thumb_4097.jpg?1165028403" /></a>