JavaScript Dancing Text - Code Libary

<html>
<body onload="doWave(0)">
<script language="JavaScript">

var theText = "this is a test";

function nextSize(i,incMethod,textLength)
{
if (incMethod == 1) return (72*Math.abs( Math.sin(i/(textLength/3.14))) );
if (incMethod == 2) return (255*Math.abs( Math.cos(i/(textLength/3.14))));
}

function sizeCycle(text,method,dis)
{
        output = "";
        for (i = 0; i < text.length; i++)
        {
                size = parseInt(nextSize(i +dis,method,text.length));
                output += "<font style='font-size: "+ size +"pt'>" +text.substring(i,i+1)+ "</font>";
        }
        theDiv.innerHTML = output;
}

function doWave(n)
{
        sizeCycle(theText,1,n);
        if (n > theText.length) {n=0}
        setTimeout("doWave(" + (n+1) + ")", 50);
}
</script>
<div ID="theDiv" align="center">
</div>
</body>
</html>