function IsNumeric(strString, strOldString)
   //  check for valid numeric strings	
   {
   var strString=document.getElementById(strString).value;
   
   if(strString=="0")
   {
		alert("Quantity cannot be zero!");
		return false;
   }
   var strValidChars = "0123456789";
   var strChar;

   if (strString.length == 0)
   {
		alert("Quantity cannot be blank!");
		return false;
   }

   //  test strString consists of valid characters listed above
	for (i = 0; i < strString.length; i++)
	{
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
         {
			alert("Invalid Quantity!");
			return false;
         }
    }
	   return true;
   }
   
    function IsNumeric1(strString, strOldString)
   //  check for valid numeric strings	
   {
   if(strString=="0")
   {
		alert("Quantity cannot be zero!");
		return strOldString;
   }
   var strValidChars = "0123456789";
   var strChar;

   if (strString.length == 0)
   {
		
		alert("Quantity cannot be blank!");
		return strOldString;
   }

   //  test strString consists of valid characters listed above
	for (i = 0; i < strString.length; i++)
	{
      strChar = strString.charAt(i);
      if (strValidChars.indexOf(strChar) == -1)
         {
			
			alert("Invalid Quantity!");
			return strOldString;
         }
    }
	   return strString;
	   
   }

// JScript File