function changeExmarks(topic)//topic -- то на что меняется значение. search or catalog
{

	document.getElementById('ex-search-mark').setAttribute('class', 'ex-search-mark  ex-search-mark-'+topic);
	document.getElementById('ex-search-mark').className = 'ex-search-mark  ex-search-mark-'+topic;
	document.getElementById('search-marked').className = 'search search-marked-'+topic;
	document.getElementById('search').style.display="none";
	document.getElementById('catalog').style.display="none";
	document.getElementById(topic).style.display="block";
}