function nei_du() {
	if ($(".form_search_tur").is(":hidden")) {
		$(".form_search_tur").slideDown();
	} 
	else {
		$(".form_search_tur").slideUp();
	}
	var obj=document.getElementById('search_tur');
	var obj1=document.getElementById('prov').innerHTML;
	if (obj1==1) {
		obj.style.background='url("/img/x_search_tur.png") no-repeat left top'; document.getElementById('prov').innerHTML=0;
	} 
	else {
		obj.style.background='url("/img/search_tur.png") no-repeat left top';  document.getElementById('prov').innerHTML=1;
	} 
};