random color sin repetir

[Lynxcraft]

Código:

<script type="text/javascript">
var list = new Array();
function changeColor(element){
	if(!list.length){
		list=new Array(1,2,3,4,5,6,7,8);
		list.sort(function() {return 0.5 - Math.random()})
	}
    var curNumber = list.shift();
    element.addClass('color' + curNumber);
    setTimeout(function(){changeColor(element)}, 2000);  
}
</script>


<script type="text/javascript">
changeColor($('#cuadrouno'));
changeColor($('#cuadrodos'));
changeColor($('#cuadrotres'));
changeColor($('#cuadrocuatro'));

</script>

Si te sirve