var run=1;  
function mail_check() {
  var ok1=1;
  var rc1='1px solid #ff0000',orc1='1px dashed #a4a4a4';
  var rb1='#FFCCCC',orb1='#FFFFFF';
  if (null === window.document.getElementById('mail_form')) {clearInterval(mailInt);return;}
  var subject=window.document.getElementById('subject_input');
  var message=window.document.getElementById('message_area'); 
  var msgRE1=/[\>\<]/;
  if(msgRE1.test(subject.value)){subject.style.backgroundColor=rb1;ok1=0;} else {subject.style.backgroundColor=orb1;} 
  if(msgRE1.test(message.value)){message.style.backgroundColor=rb1;ok1=0;} else {message.style.backgroundColor=orb1;} 
                  
  if(ok1==1) window.document.getElementById('btn_send').disabled=false;
  else window.document.getElementById('btn_send').disabled=true;
  
  
}