function leftSearch(){
	var s=document.left_search.stype;   
	var aa=s.options[s.selectedIndex].value;
	//alert(aa);
	switch(aa){
		case '1':
		//alert(aa);
		document.left_search.action="product.php";
		break;
		case '2':
		document.left_search.action="article.php";
		break;
		case '3':
		document.left_search.action="konwledge_class.php";
		break;
		case '4':
		document.left_search.action="article.php?class_1_id=5";
		break;
	}
	//alert(document.left_search.action);
}