function chec(form) {
  if (form.from.value=="") {
     alert("You email is missing!");
     form.from.focus();
     return false;
  } else if (form.subj.value=="") {
     alert("Subject is missing!");
     form.subj.focus();
     return false;
  } else if (form.text.value=="") {
     alert("Text si missing!");
     form.text.focus();
     return false;
  }
return true;
}