function calcular() {

var tsal=0;
// vinos
tsal=tsal+(128*document.forms["formpedidos"].elements["p1"].value);
tsal=tsal+(144*document.forms["formpedidos"].elements["p2"].value);

// suma total
siniva = document.getElementById("sumatotal");
siniva.innerHTML = (parseInt(tsal*100))/100 + " €";
sumasiniva = (parseInt(tsal*100))/100;

}