var ov="";

function cv(n) {
	if (ov != "" || ov == n) {
		document.getElementById(ov+"Img").src = "../../../images/pulldown.gif";
		document.getElementById(ov+"a").style.display = "none";
	}
	if (ov != n) {
		ov=n;
		document.getElementById(n+"Img").src = "../../../images/pullup.gif";
		document.getElementById(n+"a").style.display = "";
	}
	else {
		ov = "";
	}
}