Start with something like this:
jquery:
$('.disparador').click(function () {
$(this).animate({
width: ($(this).width() == 200 ? 100 : 200)
});
$(this).siblings('.painel').animate({
width: 'toggle'
});
});
HTML:
<div class='container'>
<div class='painel'>Lorem ipsum dolor sit amet.</div>
<div class='disparador'></div>
</div>
<div class='container'>
<div class='painel'>Lorem ipsum dolor sit amet.</div>
<div class='disparador'></div>
</div>
<div class='container'>
<div class='painel'>Lorem ipsum dolor sit amet.</div>
<div class='disparador'></div>
</div>
CSS:
.container {
position: relative;
width:200px;
height: 350px;
float: left;
}
.painel {
display:none;
width: 100px;
height: 350px;
overflow: auto;
position:absolute;
top: 0;
left:0;
}
.disparador {
width: 200px;
min-width: 50%;
height: 350px;
position:absolute;
top: 0;
right:0;
background-color: red;
}
JSFiddle