Spoiler Tag

<span style="background-color: rgb(255, 255, 255);"><span style="color: rgb(255, 255, 255);">HIER DEIN TEXT</span></span><br />

<script type="text/javascript"><!--
function toggle_visibility(id) {
var e = document.getElementById(id);
if(e.style.display == 'none')
e.style.display = 'block';
else
e.style.display = 'none';
}
//--></script>


<a onclick="toggle_visibility('foo');">Bitte ausklappen</a>

<div id="foo" style="display:none;">
Inhalt
</div>