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>