function toggleMap(){
    var map = document.getElementById('map');
    var mapControl = document.getElementById('map_control');

    mapSource = map.src;

    if (mapSource.indexOf("_zoomed") > -1){
        // Map is zoomed, unzoom
        map.src = "/media/images/mash_map.png";
        mapControl.innerHTML = 'zoom in';
    } else {
        // Map is not zoomed, zoom
        map.src = "/media/images/mash_map_zoomed.png";        
        mapControl.innerHTML = 'zoom out';        
    }
}

function validLogin(){
    var elUsername = document.getElementById('id_username');
    var elPassword = document.getElementById('id_password');

    if (elUsername.value == ''){
        alert('Please enter a user name');
        return(false);
    }    
    
    if (elPassword.value == ''){
        alert('Please enter a password');
        return(false);
    }    

}