function checkempty(txtval)
{
  if (txtval.length==0)
  {
    return false;
  }

  var i=0;
  while (i<txtval.length) 
  {
    if (txtval.substring(i,i+1) != ' ')
      return true;
    i=i+1;
  }
  return false;
}


function checkname()
{
  if (checkempty(document.a.realname.value)==false)
  {
    alert('Please enter your name.');
    document.a.realname.focus();
    return false;
  }

  if (checkempty(document.a.phone.value)==false)
  {
    alert('Please enter your contact Telephone number');
    document.a.phone.focus();
    return false;
  }

  if (checkempty(document.a.email.value)==false)
  {
    alert('Please enter your Email address or type none');
    document.a.email.focus();
    return false;
  }
}