function switch_left_menu(id)
{   
	var kat_layer=document.getElementById(id);
	if(kat_layer.style.display=="block")
	{
		kat_layer.style.display="none";
	}
	else
	{
		kat_layer.style.display="block";    	 
	}   
}

function show_box_checkbox(box_id, checkbox_id)
{
	var box=document.getElementById(box_id);
	var chb=document.getElementById(checkbox_id);
	if(chb.checked)
		box.style.display="block";
	else
		box.style.display="none";    	 
}