var r_text=new Array("aaa","bbb","ccc","ddd");
var r_sel=0;
function randomize(){
var i=Math.round(3*Math.random());
while (i == r_sel){
	i=Math.round(3*Math.random());
}
if (document.getElementById("divtestata")!=null)
document.getElementById("divtestata").className=r_text[i]; 
r_sel = i;
}
randomize();