Zobrazenie/skrytie

<script>
function ShowHide(id){
el=document.getElementById(id).style; 
el.display=(el.display == 'block')?'none':'block';
}
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<style>
.hidden {display: none}
</style>

<a onclick="ShowHide('The_Americas')" href="#" title="The Americas" >
<a onclick="ShowHide('Europe')" href="#" title="Europe" >
<a onclick="ShowHide('Africa')" href="#" title="Africa" >

<div id="The_Americas" class="hidden">
The Americas
</div>

<div id="Europe" class="hidden">
Europe
</div>

<div id="Africa" class="hidden">
Africa
</div>