<!DOCTYPE html>
<html>
<head>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
var countdown=60;
function settime(obj) {
if (countdown == 0) {
obj.removeAttribute("disabled");
obj.value = "Бесплатный код проверки";
countdown = 60;
return;
} else {
obj.setAttribute("disabled", true);
obj.value = "re -send (" + countdown + ")");
countdown--;
}
setTimeout(function() {
settime(obj) }
,1000)
}
</script>
<body>
<input type = "кнопка" id = "btn" value = "бесплатный код проверки" οnclick = "settime (this)" /> />
</body>
</html>