function hideLayers (sSinal, sLayer) {
    
    document.getElementById(sSinal).innerHTML = "[+]";
    document.getElementById(sLayer).style.display = 'none';
    return true;

}

function showLayers (sSinal, sLayer, sURLImagem, sTitulo, sProfessor, sEndereco, sTelefone, sEmail, sSite) {

    if (document.getElementById(sLayer).style.display == 'block') {
    
        document.getElementById(sSinal).innerHTML = "[+]";
        document.getElementById(sLayer).style.display = 'none';
    
    } else {
    
        document.getElementById(sSinal).innerHTML = "[-]";
        document.getElementById(sLayer).innerHTML = "<table style='border: solid 1px #ccc;'><tr><td rowspan='6'><img src='"+sURLImagem+"' style='border-width: 0px; width:110px; height:110px; margin-right:3px;' /></td><td style='width:100%; vertical-align:top; background-color: #e2e2e2; text-align:center'><b>"+sTitulo+"</b></td></tr><tr><td style='width:100%; vertical-align:top;'><b>Professor Resp.: </b>"+sProfessor+"</td></tr><tr><td style='width:100%; vertical-align:top;'><b>Endereço: </b>"+sEndereco+"</td></tr><tr><td style='width:100%; vertical-align:top;'><b>Telefone: </b>"+sTelefone+"</td></tr><tr><td style='width:100%; vertical-align:top;'><b>E-mail: </b>"+sEmail+"</td></tr><tr><td style='width:100%; vertical-align:top;'><b>Site: </b>"+sSite+"</td></tr></table>";
        document.getElementById(sLayer).style.display = 'block';
    
    }
    
    return true;

}