<script type="text/javascript" language="JavaScript">

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;
         }
      }
   return IsNumber;
   
   }
function ValidateForm(saform)
{
   if (!IsNumeric(saform.units.value)) 
   { 
      alert('Please enter only numbers in the units required field') 
      saform.units.focus(); 
      return false; 
      } 
 return true;
 } 
</script>