function trocar() {	
					
	var x = document.getElementById("select").value;							
								
	if( x == 'forum') {	
		document.getElementById('user').value="Usuario";
		document.getElementById('user').style.display="inline";
		
		document.getElementById('senha').value="";	
		document.getElementById('senha').style.display="none";									
		
		document.getElementById('senhatext').style.display="inline";	
										
		document.getElementById('botao').value="Login";	
		
		document.getElementById('form').action="http://www.edu.poli.usp.br/thunderatz/forum/ucp.php?mode=login";									
	}
	
	else {								
		document.getElementById('user').style.display="none";
		document.getElementById('senha').style.display="none";
		document.getElementById('senhatext').style.display="none";						
		document.getElementById('botao').value="Prosseguir";
		}
	
	if( x == "email") {	
		document.getElementById("form").action="https://www.google.com/a/thunderatz.org/ServiceLogin?service=CPanel&continue=https://mail.google.com/a/thunderatz.org";
	}
	
	if( x == "docs") {	
		document.getElementById("form").action="https://www.google.com/a/thunderatz.org/ServiceLogin?service=CPanel&continue=https://docs.google.com/a/thunderatz.org";
	}
	
	if( x == "gerenciar") {	
		document.getElementById("form").action="https://www.google.com/a/thunderatz.org/ServiceLogin?service=CPanel&continue=https://www.google.com/a/cpanel/thunderatz.org/Dashboard";
	}						
}
	
	
			
function checasenha(){
	
	if( document.getElementById('senha').value != ''){
		document.getElementById('senha').style.display="inline"
		document.getElementById('senhatext').style.display="none"
	}
}