function podmenu(id){
    for (i=1; i <= 9; i++) {
        element=document.getElementById("podmenu"+i).style;
        element.display = 'none';
    }    
    
    element=document.getElementById(id).style;  
    if(element.display == 'block') {
        element.display = 'none';
    }
    else
    {
        element.display = 'block';
    }
}