imediasun1,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
.account_btn{
background-color: #006400;
}
.account_btn_active{
background-color: #FF0000;
}
</style>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script>
$(function() {
var все_хором = $('.account_btn');
все_хором.click(function(){
все_хором.removeClass('account_btn_active').addClass('account_btn');
$(this).removeClass('account_btn').addClass('account_btn_active');
});
})
</script>
</head>
<body>
<div id="my_data_btn" class="account_btn"><p>Мои данные</p></div>
<div id="login_btn" class="account_btn"><p>Логин</p></div>
<div id="pass_btn" class="account_btn"><p>Пароль</p></div>
<div id="email_btn" class="account_btn"><p>E-mail</p></div>
</body>
</html>