function keyPressed(event) {
    if (event.keyCode == '13') {
        BuscaMapa();
    }
}
    
function BuscaMapa()
{
var Origem;
if (document.getElementById("txtCepCidade").value != '')
    {
        var Origem = document.getElementById("txtCepCidade").value;
        document.getElementById("mapaPadrao").style.display = "none";
        document.getElementById("mapaPadrao").style.height ="0px";
    }
    document.getElementById("frmMapa").style.height ="0px";
    document.getElementById("imgLoading").style.display="block";
    document.getElementById("frmMapa").src = "Localizacao_Mapa.aspx?Origem="+Origem;
    return false;
}