OP jQuery. , jQuery:
<div id="x" style="background-color:rgb(255,255,105)">hello world</div>
<script type="text/javascript">
var unBlue=100;
var gEvent=setInterval("toWhite();", 100);
function toWhite(){
if(unBlue<255) document.getElementById("x").style.backgroundColor="rgb(255,255,"+unBlue+")";
else clearInterval(gEvent);
unBlue+=10;
}
</script>