function isIE(){
	if(window.navigator.appName.indexOf('Microsoft') != -1){
		return true;	
	}else{
		return false;	
	}
}
function findTopMenu(id){
	if(isIE()){
		for(name in window.document.all){
			if(document.all[name].name == 'top_menu_'+id.toString()){
				return document.all[name];
			}
		}	
	}else{
		topElems = document.getElementsByName('top_menu_'+id.toString());
		if(topElems[0] != null){
			return topElems[0];	
		}
	}
	return null;
}
function showHiddenMenu(id){	
	if(window.loaded != true){
		return false;	
	}
    if(id != -1){
        elem = document.getElementById('top_menu_curr');
        if(elem != null){
            elem.style.visibility = 'hidden';
            elem.style.display = 'none';			
        }
		window.defTopMenu.id = '';
        elem = document.getElementById('hidden_menu_'+id.toString());
        if(elem != null){
            elem.style.visibility='visible';
            elem.style.display = '';
            window.lastVisibleId = elem.id;			
			topElem = findTopMenu(id);
			if(topElem != null){
				topElem.id = 'currentTop';
			}
        }
    }else{
        elem = document.getElementById(window.lastVisibleId);
        if(elem != null){
            elem.style.visibility='hidden';
            elem.style.display = 'none';
        }
		topElem = document.getElementById('currentTop');			
		if(topElem != null){
			topElem.id = '';			
		}
        elem = document.getElementById('top_menu_curr');
        if(elem != null){
            elem.style.visibility='visible';
            elem.style.display = '';
            window.lastVisibleId = elem.id;
        }
		window.defTopMenu.id = 'currentTop';
    }
}