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jQuery.fn.replaceWith = function(replacement) {
return this.each(function(){
element = $(this);
$(this)
.after(replacement).next()
.attr('class', element.attr('class')).attr('id',element.attr('id'))
.html(element.html())
.prev().remove();
});
};

/*
usage example

$('a#fooid').replaceWith('<span></span>');

before:
<a id="fooid" class="whatever">some text</a>

after:
<span id="fooid" class="whatever">some text</span>

*/

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