function start() {
  document.preps1.q1.focus();
}

function validate() {
 
  if (document.preps1.q1.value !="in") {
      alert("try again for 1");
      document.preps1.q1.focus();
      document.preps1.q1.select();
      return false;
}
  if (document.preps1.q2.value !="in") {
      alert("try again for 2");
      document.preps1.q2.focus();
      document.preps1.q2.select();
      return false;
    }
 
  if (document.preps1.q3.value !="at"){
      alert("try again for 3");
       document.preps1.q3.focus();
       document.preps1.q3.select();
       return false; 
}
  if (document.preps1.q4.value !="on"){
      alert("try again for 4");
      document.preps1.q4.focus();
      document.preps1.q4.select();
      return false;
  }
  if (document.preps1.q5.value !="on"){
      alert("try again for 5");
      document.preps1.q5.focus();
      document.preps1.q5.select();
      return false;
  }
  if (document.preps1.q6.value !="in"){
      alert("try again for 6");
      document.preps1.q6.focus();
      document.preps1.q6.select();
      return false;
  }
  if (document.preps1.q7.value !="on"){
      alert("try again for 7");
      document.preps1.q7.focus();
      document.preps1.q7.select();
      return false;
  }
  if (document.preps1.q8.value !="in"){
      alert("try again for 8");
      document.preps1.q8.focus();
      document.preps1.q8.select();
      return false;
  }
  if (document.preps1.q9.value !="at"){
      alert("try again for 9");
      document.preps1.q9.focus();
      document.preps1.q9.select();
      return false;
  }
  if (document.preps1.q10.value !="at"){
      alert("try again for 10");
      document.preps1.q10.focus();
      document.preps1.q10.select();
      return false;
  }
   if (document.preps1.q11.value !="in") {
      alert("try again for 11");
      document.preps1.q11.focus();
      document.preps1.q11.select();
      return false;
}
  if (document.preps1.q12.value !="at") {
      alert("try again for 12");
      document.preps1.q12.focus();
      document.preps1.q12.select();
      return false;
    }
 
  if (document.preps1.q13.value !="on"){
      alert("try again for 13");
       document.preps1.q13.focus();
       document.preps1.q13.select();
       return false; 
}
  if (document.preps1.q14.value !="on"){
      alert("try again for 14");
      document.preps1.q14.focus();
      document.preps1.q14.select();
      return false;
  }
  if (document.preps1.q15.value !="in"){
      alert("try again for 15");
      document.preps1.q15.focus();
      document.preps1.q15.select();
      return false;
  }
  if (document.preps1.q16.value !="in"){
      alert("try again for 6");
      document.preps1.q16.focus();
      document.preps1.q16.select();
      return false;
  }
  if (document.preps1.q17.value !="at"){
      alert("try again for 17");
      document.preps1.q17.focus();
      document.preps1.q17.select();
      return false;
  }
  if (document.preps1.q18.value !="on"){
      alert("try again for 18");
      document.preps1.q18.focus();
      document.preps1.q18.select();
      return false;
  }
  if (document.preps1.q19.value !="on"){
      alert("try again for 19");
      document.preps1.q19.focus();
      document.preps1.q19.select();
      return false;
  }
  if (document.preps1.q20.value !="on"){
      alert("try again for 20");
      document.preps1.q20.focus();
      document.preps1.q20.select();
      return false;
  }    
   alert("Good work. All your answers are correct.");
   return true;
}

function answers() {
    NewWin=window.open('answers.html','NewWin',
   'toolbar=no,status=no,width=200,height=360');
}