function checkform()
{
//type of membership
  if(form1.tselect1.value == "")
  {
  alert("Please select Type of Membership");
  form1.tselect1.focus();
  return false;
  }
  
//full name
  if(form1.tfullname.value == "")
  {
  alert("Please enter your Full Name");
  form1.tfullname.focus();
  return false;
  }  
  
//mobile
  if(form1.tmobile.value == "")
  {
  alert("Please enter your Mobile Number");
  form1.tmobile.focus();
  return false;
  }
  
//email address
  if(form1.temail.value == "")
  {
  alert("Please enter an Email Address");
  form1.temail.focus();
  return false;
  }
  
  if (form1.temail.value.indexOf("@")  == "-1")
  {
  alert("Please enter a correct email address, it must contain an @ symbol.");
  form1.temail.focus();
  return false;
  }
  
  if (form1.temail.value.indexOf(".")  == "-1")
  {
  alert("Please enter a correct email address, it must contain an . symbol.");
  form1.temail.focus();
  return false;
  }

//nationality
  if(form1.tnationality.value == "")
  {
  alert("Please enter your Nationality");
  form1.tnationality.focus();
  return false;
  }
}