Nested divs of same class, show child on hover

Question

I'm trying to show a hidden div on hover of its parent.
My issue is that there are nested divs of the same class, and when I hover an "inner" div, its parent is also hovered and both their hidden children are shown.
html:

<div class="a_class">
    lorem ipsum
    <div class="inner">
        <a href="">hidden...</a>
    </div>
    <div class="b_class">
        blahblah<br />
        <div class="a_class">
            <div class="inner">
                <a href="">hidden...</a>
            </div>
            lorem ipsum
        </div>
    </div>
</div>

css:

.inner{display:none;}
.a_class:hover > .inner{display: block;}

fiddle: http://jsfiddle.net/Nb6tD/

In other words, i'm trying to achieve this: when i hover over the second .a_class, only the .inner under it should show up, not the .inner under the "parent" .a_class.

Is it possible only with css?

Thanks in advance

EDIT: the answer
So, it appears it CAN'T be done with pure css, unless the html markup changes - which is not possible in my case. I wished for a css3-magic solution, but since there's no such option, i'm going javascript.

I accepted the most suitable solution though for future reference, for all out there that have the possibility of changing the html structure.

Answer 1

I don't think you can "fix" this without changing the html structure - you could have an element enclosing the hoverable area and its corresponding button:

Here, i've added a .hoverArea div. (Extra div not needed on the innermost one, as it only contains a single .inner)

html

<div class="a_class">
    <div class="hoverArea">
        lorem ipsum
        <div class="inner">
            <a href="">hidden...</a>
        </div>
    </div>
    <div class="b_class">
        blahblah<br />
        <div class="a_class hoverArea">
            <div class="inner">
                <a href="">hidden...</a>
            </div>
            lorem ipsum
        </div>
    </div>
</div>

css

.hoverArea:hover > .inner{
    display: block;
}

Demo at http://jsfiddle.net/Nb6tD/7/