Limit HTML text box input to only numbers and decimal points

Limit HTML text box input to only numbers and decimal points

Code:

<input type="text" class="txt" name="qty" value="" onkeyup="this.value=this.value.replace(/[^0-9\.]/g,'')" />

PS: js implements a text box that can only input numbers and decimal points

<html><head><meta http-equiv="content-Type" content="text/html;charset=gb2312"><title>js can only input numbers and decimal points</title>
<script language="JavaScript" type="text/javascript">
function clearNoNum(obj){ obj.value = obj.value.replace(/[^\d.]/g,""); //Clear characters other than "number" and "." obj.value = obj.value.replace(/^\./g,""); //Verify that the first character is a number and not a . 
  obj.value = obj.value.replace(/\.{2,}/g,"."); //Only keep the first one. Clear the rest.   
obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");

}
</script>
</head><body>Text box that can only input numbers and decimal points: <input name="input1" onkeyup="clearNoNum(this)"></body></html>

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