function toggle_button_main_menu_item(element, event_name, event) {                          
                    switch(event_name) {              
                      case 'mouseover' :   break;                  
                      case 'mouseout'  :    break;
                    }                              
             }function toggle_button_sub_menu_item(element, event_name, event) {                          
                    switch(event_name) {              
                      case 'mouseover' :   break;                  
                      case 'mouseout'  :    break;
                    }                              
             }function toggle_button_language_menu_item(element, event_name, event) {                          
                    switch(event_name) {              
                      case 'mouseover' :  $(element.id + '_1').hide();$(element.id + '_2').show(); break;                  
                      case 'mouseout'  :  if(language_menu_item_id != element.id) { $(element.id + '_2').hide();$(element.id + '_1').show();  }  break;
                    }                              
             }function toggle_button_footer_menu_item(element, event_name, event) {                          
                    switch(event_name) {              
                      case 'mouseover' :   break;                  
                      case 'mouseout'  :    break;
                    }                              
             }  
			function scrollVertical(value, element, slider) {
				element.scrollTop = Math.round(value/slider.maximum*(element.scrollHeight-element.offsetHeight));
			}