一个转换金钱为大写的JS函数

<script type="text/javascript">
<!--
function formatMoney(mnum)
{
var mnum = parseFloat(mnum);
var strOutput="",strTemp="",strInTemp='';
var unitArray = new Array("圆万亿","仟佰拾","零壹贰叁肆伍陆柒捌玖");
var mnumArray = mnum.toString().split('.');
var integralnum = mnumArray[0];
var integrallen = integralnum.length;
var decimalnum = (mnum.toString().indexOf('.')>=0) ? mnumArray[1].substr(0, 2) : '0';
var decimallen = decimalnum.length;
var ints = parseInt(integrallen/4);
var inty = integrallen%4;
if (ints>3 || (ints==3 && inty>0)) return "超出范围";
if (inty>0)
{
ints++;
integralnum = "0000".substr(inty)+integralnum;
integrallen = integralnum.length;
}
var i = 0;
while (i<integrallen)
{
var strOutTemp = "";
strTemp = integralnum.substr(i, 4);
i += 4;
for (var j=0; j<4; j++)
{
strInTemp = parseInt(strTemp.substr(j, 1));
strOutTemp += unitArray[2].substr(strInTemp, 1);
if (strInTemp>0 && j<3) strOutTemp += unitArray[1].substr(j, 1);
}
strOutTemp = strOutTemp.replace(/零+$/, "");
ints--;
if (strOutTemp!="") strOutTemp += unitArray[0].substr(ints, 1);
if (strTemp.substr(3,1)=='0') strOutTemp += "零";
strOutput += strOutTemp;
}
strOutput = strOutput.replace(/零+/g, "零").replace(/^零/, "").replace(/零$/, "");
if (strOutput=="圆") strOutput = "";
if (decimallen==2)
{
strOutput += (decimalnum.charAt(0)!='0') ? unitArray[2].substr(parseInt(decimalnum.charAt(0)), 1)+"角" : "零";
if (strOutput=="零") strOutput = "";
strOutput += unitArray[2].substr(parseInt(decimalnum.charAt(1)), 1)+"分";
}
else
{
if (decimalnum!='0') strOutput += unitArray[2].substr(parseInt(decimalnum), 1)+"角";
if (strOutput!="") strOutput += "整";
}
if (strOutput=="") strOutput = "金额为零";
return strOutput;
}
//-->
</script>
<input type="text" id="money" name="money" value="123456789.54">
<input type="button" value="转换" onclick="document.getElementById('show').innerHTML=formatMoney(document.getElementById('money').value)">
<div id="show"></div>