function changeMap(tab)
{
    switch(tab){
        case ("map"):
            if(document.getElementById('map-tab') != null){
                document.getElementById('map-tab').className = "nav_button_middle selectedMenu";
            }
            if(document.getElementById('streetview-tab') != null ){
                document.getElementById('streetview-tab').className = "nav_button_middle notSelected";
                document.getElementById("streetview-container").style.display = "none";
            }
            if(document.getElementById('video-tab') != null){
                document.getElementById('video-tab').className = "nav_button_middle notSelected";
                document.getElementById("video-container").style.display = "none";
            }
            break;
        case ("video"):
            if(document.getElementById('streetview-tab') != null ){
                document.getElementById('streetview-tab').className = "nav_button_middle notSelected";
                document.getElementById("streetview-container").style.display = "none";
            }
            if(document.getElementById('video-tab') != null){
                document.getElementById('video-tab').className = "nav_button_middle selectedMenu";
                document.getElementById("video-container").style.display = "block";
            }
            if(document.getElementById('map-tab') != null){
                document.getElementById('map-tab').className = "nav_button_middle notSelected";
            }
            break;
        case ("streetview"):
            if(document.getElementById('streetview-tab') != null ){
                document.getElementById('streetview-tab').className = "nav_button_middle selectedMenu";
                document.getElementById("streetview-container").style.display = "block";
            }
            if(document.getElementById('map-tab') != null){
                document.getElementById('map-tab').className = "nav_button_middle notSelected";
            }
            if(document.getElementById('video-tab') != null){
                document.getElementById('video-tab').className = "nav_button_middle notSelected";
                document.getElementById("video-container").style.display = "none";
            }
            break;
        default:
             if(document.getElementById('streetview-tab') != null ){
                document.getElementById('streetview-tab').className = "nav_button_middle selectedMenu";
                document.getElementById("streetview-container").style.display = "block";
             }
             if(document.getElementById('map-tab') != null){
                document.getElementById('map-tab').className = "nav_button_middle notSelected";
             }
             if(document.getElementById('video-tab') != null){
                document.getElementById('video-tab').className = "nav_button_middle notSelected";
                document.getElementById("video-container").style.display = "none";
             }
            break;
    }
}