function changeClass(obj){
	var elem = document.getElementById(obj);
	if(elem.className == "opacmenu"){
		elem.className="nopacmenu";
	}else{
		if(elem.className == "nopacmenu"){
			elem.className="opacmenu";
		}
	}
}

function imgon(obj,$path_img_on){
	var elem = document.getElementById(obj);
	elem.src = $path_img_on;
}
function imgoff(obj,$path_img_off){
	var elem = document.getElementById(obj);
	elem.src = $path_img_off;
}