function validateauction() {

var ba = document.bu.bidamount.value;

if (ba == '') {
alert('Please enter Bid.');
document.bu.bidamount.focus();
return false;
}
else {
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

 
   for (i = 0; i < ba.length && IsNumber == true; i++) 
      { 
      Char = ba.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) 
         {
         alert('ENTER NUMBERS 0-9 ONLY.');
         return false;
         }
      }

return true;

      }
   }