// JavaScript Document
function efetuar_operacao(btu,valor,cell)
    {       
        if (valor == "+")
        {
            document.getElementById(btu).value="-";
            document.getElementById(cell).style.display="block";
            document.getElementById(btu).src="img/toc2.gif";
            document.getElementById(btu).title="Esconder Detalhes";
            document.getElementById(btu).align="absmiddle";
            document.getElementById('f'+btu).style.color="#74270d";
            //document.getElementById('f'+btu).style.textDecoration="underline";
        }
        else
        {
            document.getElementById(btu).value="+";
            document.getElementById(cell).style.display="none";
            document.getElementById(btu).src="img/toc1.gif";
            document.getElementById(btu).title="Mostrar Detalhes";
            document.getElementById(btu).align="absmiddle";
            document.getElementById('f'+btu).style.color="black";
            //document.getElementById('f'+btu).style.textDecoration="none";
        }
    }