function showMenu(id){
	$(id+'_menu').className = 'mhover';
	$(id+'_menu_dropdown').show();
}

function hideMenu(id){
	$(id+'_menu').className = '';
	$(id+'_menu_dropdown').hide();
}

function showThemes(){
	$('theme-link').show();
}

function hideThemes(){
	$('theme-link').hide();
}

function showTip(type){
	$(type+'-img-tip').show();
}

function hideTip(type){
	$(type+'-img-tip').hide();
}