function BuscaMapa()
{   
    if (document.getElementById("txtCepCidade").value == "")
        return false;
   
    var Origem = document.getElementById("txtCepCidade").value;
    document.getElementById("frmMapa").style.height ="0px";
    document.getElementById("imgLoading").style.display="block";
    document.getElementById("frmMapa").src = "Mapa.aspx?Origem=" + Origem;
}