function servicos()
{
    if(document.getElementById("dvServicos").style.display=="block" && 
	document.getElementById("dvServicos").style.visibility=="visible"){
		document.getElementById("dvServicos").style.display="none";  
		document.getElementById("dvServicos").style.visibility="hidden";  
		document.getElementById("img_serv").src="imagens/menu_serv_1.gif";  		
    }  
    else{
		document.getElementById("dvServicos").style.display="block";  
		document.getElementById("dvServicos").style.visibility="visible";  
		document.getElementById("img_serv").src="imagens/menu_serv_2.gif";  
    }
}