$(document).ready(function () {
    map_Base = new Image();
    map_Base.src = "/_layouts/rga/images/map_base.gif";

    map_UnitedStates = new Image();
    map_UnitedStates.src = "/_layouts/rga/images/map_unitedstates.gif";

    map_Canada = new Image();
    map_Canada.src = "/_layouts/rga/images/map_canada.gif";

    map_ESA = new Image();
    map_ESA.src = "/_layouts/rga/images/map_esa.gif";

    map_AsiaPacific = new Image();
    map_AsiaPacific.src = "/_layouts/rga/images/map_asiapacific.gif";
});

function swapMapImg(mapID, imgID) {
    var region = document.getElementById(mapID);

    if (imgID == "unitedstates")
        region.src = map_UnitedStates.src;
    else if (imgID == "canada")
        region.src = map_Canada.src;
    else if (imgID == "esa")
        region.src = map_ESA.src;
    else if (imgID == "asiapacific")
        region.src = map_AsiaPacific.src;
    else
        region.src = map_Base.src;
}