function SwitchMenu(obj){
        if(document.getElementById){
        var el = document.getElementById(obj);
        var ar = document.getElementById('cont').getElementsByTagName('DIV');
                if(el.style.display == 'none'){
                        for (var i=0; i<ar.length; i++){
                                ar[i].style.display = 'none';
                        }
                        el.style.display = 'block';
                }else{
                        el.style.display = 'none';
                }
        }
}