WOW, Thanks Jerome.
It's like the plugin has been re-written just for me ;-)

Appreciate your hard work.

PS for everyone - I am using Elgg 1.7.1, so can confirm it works on this version.

i tried to come up with that adclose, however i failed.

but this is my temporary solution.

in mod/target_blank/views/default/target_blank/metatags.php

replace with this

<?php

?>
<script type="text/javascript">
 $(document).ready(function(){
  $('a[rel=nofollow]')
  $('a[href^="http://"]:not([href^="<?php echo $vars["url"];?>"])').attr("target", "_blank").after(' <img src="/_graphics/external.png" alt="external link"/>');
});
</script>

and in mod/target_blank/views/default/target_blank/widget.php

replace with

<?php
 $callback = get_input("callback");
 $widget = $vars["entity"];
 
 if($callback == "true"){
  
?>
<script type="text/javascript">
 $('a[rel=nofollow]')
 $('#widget<?php echo $widget->guid; ?> a[href^="http://"]:not([href^="<?php echo $vars["url"];?>"])').attr("target", "_blank").after(' <img src="/_graphics/external.png" alt="external link"/>');
</script>
<?php } ?>

Im not sure if the nofollow works correcly being used this way, hope so. and now just drop a 10x10 external image   into your graphics folder. this was the best i could do.

thanks for the mod Jerome.

lolz addie.. i cud probably fix this up, but you don't reply to my emails ;-)

have a look at http://tea.braintrainz.com/ for an example of opening external url in a modal popup whihc can be extended to show a 'warning'

oki doki addi http://tea.braintrainz.com/ now has a "warning" alert for the external dictionary urls if you wanna check it out ;-)

Excellent plugin. Should be a standard control in future versions of Elgg (under Site Admin?).

GREAT JOB! works in 1.7.2 also