There is more than one way to do this, I do not know how your site is. One of the ways to do this is to assign an id to the body of your page and the menu links and then find them in the style sheet:
Your html page for example:
<body id="home">
<ul id="menu">
<li><a href="home.html" id="homeLink">Home</a></li>
<li><a href="enderecos.html" id="enderecosLink">Endereços</a></li>
<li><a href="servicos.html" id="servicosLink">Serviços</a></li>
<li><a href="contto.html" id="contatoLink">Contato</a></li>
</ul>
</body>
Now you need to identify and style these elements there in your style sheet:
body#home a#homeLink, body#enderecos a#enerecosLink,
body#servicos a#servicosLink, body#contatoLink a#contatoLink {
cursor: default;
background-color: red;
color: white;
}
JsFiddle: link