Можно текущую поллитру своять
<div style=position:absolute;z-index:-120;">
<span id=color1 style="background-color:#FF0000">a</span>
<span id=color2 style="background-color:#0000FF">a</span>
<span id=color3 style="background-color:#00FF00">a</span>
</div>
<script type="text/javascript">
var color=[];
color.push(document.getElementById('color1').style.backgroundColor)
color.push(document.getElementById('color2').style.backgroundColor)
color.push(document.getElementById('color3').style.backgroundColor)
</script>