EDIT:
I have a custom php function setup to show the wordpress post excerpt and when the read more link is clicked the excerpt is hidden and the main content displayed. However i want the read more button to become a hide button for when the content is expanded.
<?php the_excerpt();
echo '<a value="show more..." onclick="$(this).prev().hide(); $(this).next().show();" >Read More</a>';
echo '<div style="display:none">';
echo the_content();
echo '</div>'; ?>
to keep it simple, you can do something like this:
<div id="shortcontent">
<?php the_excerpt(); ?>
<a href="javascript:void(0)" onclick="$('#shortcontent').hide();$('#fullcontent').show();">Read more</a>
</div>
<a href="javascript:void(0)"></a>
<div id="fullcontent" style="display: none">
<?php the_content(); ?>
<a href="javascript:void(0)" onclick="$('#fullcontent').hide();$('#shortcontent').show();">Hide</a>
</div>
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