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Rails Image Tag Rollover Helper

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<%= image_tag "/images/btn-off.jpg", :mouseover => "/images/btn-on.jpg" %>
which translates into...
<img alt="btn-off" onmouseout="this.src='/images/btn-off.jpg?1210954796'" 
src="/images/btn-off.jpg?1210954796" />
now with a link wrapped around the image tag
<%= link_to image_tag("/images/btn-off.jpg", :mouseover => "/images/btn-on.jpg"), :action => "perform" %>
and also as an image submit button for a form
<%= image_submit_tag "/images/btn-off.jpg", :mouseover => "/images/btn-on.jpg"%>