Format decimal number...

is anyway to format more than two decimal point using javascript?
for example 123.00000 ( 5 decimal point )
or using java code to format?

<%@ page contentType="text/html;charset=windows-1252"%>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
    <title>Format decimal</title>
</head>
<SCRIPT language="javascript">
function setDecimal(){
      var num = document.forms[0].num.value;
      var dec = "";
      var nums = "";
      if(isNaN(num)){
        alert('Not a number!');
        document.forms[0].num.value = "";
      }else{
        if(num.indexOf(".")>-1){
          dec = num.substring(num.indexOf(".")+1,num.length);
          if(dec.length<5){
            var num1 = 5 - dec.length;
            nums = num;
            for(var x = 0;x<num1;x++){
              nums = nums + "0";
            document.forms[0].num.value = nums;
          }else if(dec.length>5){
            if(parseInt(dec.charAt(5),10)>4){
              nums = parseInt(dec.substring(0,5),10)+1;
            }else{
              nums = parseInt(dec.substring(0,5),10);
            nums = num.substring(0,num.indexOf("."))+"."+nums;
            document.forms[0].num.value = nums;
        }else{
          document.forms[0].num.value = num+".00000";
</SCRIPT>
<body>
<form>
    <input type="text" name="num"/>
    <input type="button" value="format" onclick="setDecimal()" />
</form>
</body>
</html>

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