function isNumberKey(evt)
{
  var charCode = (evt.which) ? evt.which : event.keyCode
  if (charCode > 31 && (charCode < 48 || charCode > 57))
     alert('Please enter only numbers');
  return true;
}

function isCharKey(evt) {
	var charCode = (evt.which) ? evt.which : event.keyCode
	//alert(charCode);
    if (charCode > 32 && (charCode < 65 || charCode > 90) && (charCode < 97 || charCode > 122))
         alert('Please enter only characters');
    return true;
}