> jQuery
> -------------------
> $(document).ready(function() {
>  $('#foo').click(function() {
>    $(this).css("backgroundColor", "blue");
>  });
> });
>


Sorry but this is not equivalent to observe

this is

$(document).ready(function() {
 $('#foo').live("click",function() {
   $(this).css("backgroundColor", "blue");
 });
});


and it can be shorter

$($('#foo').live("click",function() {
   $(this).css("backgroundColor", "blue");
 }));

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