function SetNoActiv(num)
{
	document.getElementById("left_path"+num).src="/img/left_path_main_menu.jpg";
	document.getElementById("activ_elem_menu"+num).className="no_activ_elem_menu";
	document.getElementById("right_path"+num).src="/img/right_path_main_menu.jpg";
}
function SetActive(num)
{
	document.getElementById("left_path"+num).src="/img/right_and_left_activ.jpg";
	document.getElementById("activ_elem_menu"+num).className="activ_elem_menu";
	document.getElementById("right_path"+num).src="/img/right_and_left_activ.jpg";
}
function knopka(sender)
{
	switch(sender){
		case 'port_left':
			stepcarousel.stepBy('to_gal', -1);
			document.getElementById(sender+'_img').style.display = 'block';
			window.setTimeout("hide_block1()",600);
		break;							
		case 'port_right':
			stepcarousel.stepBy('to_gal', 1);
			document.getElementById(sender+'_img').style.display = 'block';
			window.setTimeout("hide_block2()",600);
		break;
	}
}
function hide_block1()
{ 
	document.getElementById('port_left_img').style.display = 'none';
}
function hide_block2()
{
	document.getElementById('port_right_img').style.display = 'none';
}
document.getElementsByClassName = function(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = this.getElementsByTagName('*');
	for (var i = 0; i < elem.length; i++) {
		var classes = elem[i].className;
		if (myclass.test(classes)) retnode.push(elem[i]);
	}
	return retnode; // возвращает массив объектов
};