function isValidEmail(strEmail){
  validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;

   // search email text for regular exp matches
    if (strEmail.search(validRegExp) == -1) 
   {
       return false;
    } 
    return true; 
}

function checkform ( form )
{
  if (form.from.value == "") {
    alert( "Email harus diisi!" );
    form.from.focus();
    return false ;
  }
  if (!isValidEmail(form.from.value)) {
    alert( "Format email tidak benar!" );
    form.from.focus();
    return false ;
	
  }

  if (form.question.value == "") {
    alert( "Pertanyaan harus diisi!" );
    form.question.focus();
    return false ;
  }
  if (form.captcha.value == "") {
    alert( "Kode captcha harus diisi!" );
    form.captcha.focus();
    return false ;
  }

 

return true;

}