No mas de un punto en un campo de texto

[jgabrielsinner10]

Código:

<SCRIPT language=Javascript>
  <!--
  function isNumberKey(evt, valor)
  {
	 var charCode = (evt.which) ? evt.which : event.keyCode;
	 var keychar = String.fromCharCode(charCode);
	 var valid = valor.split(".");
	 
	 if ((charCode > 31 && (charCode < 48 || charCode > 57)) && (keychar!="." || valid.length>1)){
			return false;
	 }

	 return true;
  }
  //-->
</SCRIPT>