function IsNumeric(strString)   //  check for valid numeric strings	
	{
	var strValidChars = "0123456789";
	var strChar;
	var blnResult = true;
	
	if (strString.length == 0) return false;//  test strString consists of valid characters listed above
	for (i = 0; i < strString.length && blnResult == true; i++)
	  {
	  strChar = strString.charAt(i);
	  if (strValidChars.indexOf(strChar) == -1)
		 {blnResult = false;}
	  }
	return blnResult;
	}
	
function IsNumericWithDec(strString)   //  check for valid numeric strings	
	{
	var strValidChars = "0123456789.";
	var strChar;
	var blnResult = true;
	
	if (strString.length == 0) return false;//  test strString consists of valid characters listed above
	for (i = 0; i < strString.length && blnResult == true; i++)
	  {
	  strChar = strString.charAt(i);
	  if (strValidChars.indexOf(strChar) == -1)
		 {blnResult = false;}
	  }
	return blnResult;
	}