function mark(mask, type) {
   
   var elements = $$('input[name*="' + mask + '"]');
  
   if (!type) type = ''; else type = 'checked';

   for(var i=0;i<elements.length;i++) 
     elements[i].checked = type;  
}

function activeButton() {
  
  
   var elements = $$('input[name*="checkbox_"]');
   flag = 0;  
   for(var i=0;i<elements.length;i++) 
    //alert(elements[i].checked);
     if (elements[i].checked) flag = 1;  
    //alert(elements[1].checked); 
   if ($('email').value != '' && flag == 1) {
     $('subscribe_btn').disabled = '';
   } else {
     $('subscribe_btn').disabled = 'disabled';
   }
}

function hideLayer(id) {
  $(id).hide();
}

function showLayer(id) {  
  
  $(id).toggle();
}