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http://jsfiddle.net/3wCDB/1/

<div class="first">Toggle first</div>
    <p class="first-p">First hidden paragraph.</p>
<div class="first">Toggle second</div>
    <p class="first-p">Second hidden paragraph.</p>
    
--------------------------------------------------
$('.first-p').hide();   
$( "div.first" ).click(function() {
    $(this).next().slideToggle(400);
});

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itt a next()-et ha kicserélem prev()-re akkor az elozot fogja nezni