js function code that restricts text boxes to integers and currency

Limit to integers

<html>
<head>
<script language="javascript" type="text/javascript">
 var G=;
 function checkNumber(){
  var reg = /^(?:0|[1-9][0-9]?|100)$/;
   
  var strNumber = G("txtNumber").value;
  alert((strNumber))
 }
</script>
</head>
<body >
<input type="text" value=""  title="Please enter a number witch between 0 and 100 ..">
<button onclick="checkNumber();">CheckNumber</button>
</body>
</html>

Limit to currency

&lt;script language="JavaScript" type="text/javascript"&gt;
&lt;!--
function checkMoney(obj){
var tempValue=(/(^\s+)|(\s+$)/g,'');
if(!tempValue){return;}
if(/^-?\d+(\.\d+)?$/.test(tempValue)){
=parseFloat(tempValue).toFixed(2);
}else{
alert('Please enter the legal currency value!  ');
();
return;
}
}
//--&gt;
&lt;/script&gt;
onblur="checkMoney(this)"