function changeMap(tab)
{
    if(tab == "map") {
        document.getElementById("streetview-container").style.display = "none";
        document.getElementById('map-tab').className = "nav_button_middle selectedMenu";
        document.getElementById('streetview-tab').className = "nav_button_middle notSelected";
    } else {
        document.getElementById("streetview-container").style.display = "block";
        document.getElementById('streetview-tab').className = "nav_button_middle selectedMenu";
        document.getElementById('map-tab').className = "nav_button_middle notSelected";
    }
}