function view_models_combo(object,form_num){

    clear_model_views(form_num);

    var id = 'model'+form_num+'_'+object.options[object.selectedIndex].id;
    document.getElementById(id+'_view').style.display='';
    document.getElementById(id).disabled=false;
}

function clear_model_views(form_num){
    var view=document.getElementById('models_view'+form_num);
    var selects=view.childNodes;

    for(var i=0;i<selects.length;i++){
        selects[i].style.display='none';
        selects[i].disabled=true;
    }

}

function get_selected_option(select){
    var view=document.getElementById(select.name+'_view');
    view.innerHTML=select.options[select.selectedIndex].value;
}