function show_hide( name, act, menu_name ){
	menu = menu_name || 'menu';
	if( current_part != name)
		document.getElementById('img_'+name).src = '/img/' + menu + '/' + name + '_' + act + '.gif';
}

// preload pictures
preload_pic = new Array;
preload_pic[0] = new Image(); preload_pic[0].src = "/img/menu/printing_over.gif";
preload_pic[1] = new Image(); preload_pic[1].src = "/img/menu/design_over.gif";
preload_pic[2] = new Image(); preload_pic[2].src = "/img/menu/souvenirs_over.gif";
preload_pic[3] = new Image(); preload_pic[3].src = "/img/menu/customers_over.gif";
preload_pic[4] = new Image(); preload_pic[4].src = "/img/menu/press_over.gif";
preload_pic[5] = new Image(); preload_pic[5].src = "/img/menu/contact_over.gif";

preload_pic[6] = new Image(); preload_pic[6].src = "/img/icons/home_over.gif";
preload_pic[7] = new Image(); preload_pic[7].src = "/img/icons/feedback_over.gif";
preload_pic[8] = new Image(); preload_pic[8].src = "/img/icons/sitemap_over.gif";