IE8 CSS selector ~ (tilde) adresses only first element

IE 8 will address only the first tooltip element "a[data-tooltip="sk_5 …" instead the preceeding ones too.

The HTML:

<div class="skcontainer">
   <a class="specialClassifications classification classfication_6" href="/de/ueberuns/romantik-siegel" data-tooltip="sk_6"></a>
   <a class="specialClassifications classification classfication_9" href="/de/ueberuns/romantik-siegel" data-tooltip="sk_9"></a>
   <a class="specialClassifications classification classfication_112" href="/de/ueberuns/romantik-siegel" data-tooltip="sk_112"></a>
   <a class="specialClassifications classification classfication_8" href="/de/ueberuns/romantik-siegel" data-tooltip="sk_8"></a>
   <div class="sks sk_5"><span class="inner"><p>'Gelber Schlüssel' für Romantik Hotels &amp; Restaurants mit luxuriösem Angebot. Für Gäste, die höchste Ansprüche an Stil, Ambiente, Genuss und Gastlichkeit stellen.</p></span></div>
   <div class="sks sk_6"><span class="inner"><p>TEXT</p></span></div>
   <div class="sks sk_7"><span class="inner"><p>TEXT</p></span></div>
   <div class="sks sk_8"><span class="inner"><p>TEXT</p></span></div>
</div>

Here's the CSS:

.sks {visibility:hidden; position: absolute; z-index: 100}
a[data-tooltip]:before {content: ""; position: absolute; visibility: hidden}
a[data-tooltip]:hover:before, a[data-tooltip="sk_5"]:hover ~ .sk_5,
a[data-tooltip="sk_6"]:hover ~ .sk_6, a[data-tooltip="sk_7"]:hover ~ .sk_7,
a[data-tooltip="sk_8"]:hover ~ .sk_8, a[data-tooltip="sk_9"]:hover ~ .sk_9,
a[data-tooltip="sk_10"]:hover ~ .sk_10, a[data-tooltip="sk_11"]:hover ~ .sk_11 {visibility: visible}

Any (CSS only) ideas or hints? Thanks a lot!