function checkemail(emailin)
{
 var ch;
  var NumArrobas = 0;
  var NumArrobas2 = 0;
  var checkStr = emailin;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
      if (ch == "@"){
	  NumArrobas++;
	}
	if (ch == "."){
	  NumArrobas2++;
	}

  }
  if (NumArrobas == 0 || NumArrobas > 1 || NumArrobas2 == 0 || NumArrobas2 > 2)
  {
    return (false);
  }
  else
   return (true);
}

function checknum(num)
{
 


  for (i = 0;  i < num.length;  i++)
  {
   if(num.charCodeAt(i)<48 || num.charCodeAt(i) > 57)
    return (false);
  }
 
   return (true);
}