var run=1;  
function send_check() {
  var ok=1;
  var rc='1px solid #ff0000',orc='1px dashed #a4a4a4';
  var rb='#ff0000',orb='#000000';

  if(undefined===document.forms['chat_msg_form']) {clearInterval(interval); return;} 
  if(run) {   
    var frm=document.forms['chat_msg_form'];
     
    var msg=frm.elements['msg'];
    var msgRE=/[\>\<]/;
      if(msgRE.test(msg.value)){msg.style.backgroundColor=rb;ok=0;}else {msg.style.backgroundColor=orb;} 
                 
    if(ok==1) frm.sbut.disabled=false;else frm.sbut.disabled=true;
  }
  if(null !== document.getElementById('tipAmount')) {
    ok=1;
    var tip_amount=document.getElementById('tipAmount');
    var tip_amountRE=/[^0-9.,]/;
    if(tip_amountRE.test(tip_amount.value)){tip_amount.style.backgroundColor=rb;ok=0;}else {tip_amount.style.backgroundColor=orb;} 
    if(tip_amount.value == "") ok=0; 
    var give_btn=document.getElementById('giveTipControl');
    if(ok==1) give_btn.disabled=false;
    else give_btn.disabled=true; 
  } 
}