function hide_all_forms(){
    var container=document.getElementById('logicontainer');
    
    var forms=container.getElementsByTagName('form');
    for(var i=0; i<forms.length;i++){
        forms[i].style.display='none';
    }
}

function show_single_form(id){
    hide_all_forms();
    document.getElementById(id).style.display='';
    
}