Javascript IsNumeric Function

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In Javascript there is no IsNumeric function so you can use this function to check numerical values:

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function IsNumeric(sText)
{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;


   for (i = 0; i < sText.length && IsNumber == true; i++)
      {
      Char = sText.charAt(i);
      if (ValidChars.indexOf(Char) == -1)
         {
         IsNumber = false;
         break;
         }
      }
   return IsNumber;
   
   }