var loginButtonImageSrc = "/img/common/unav_login_open.gif";
var loginButtonImageIntervalId;
function toggleLoginLayer() {
	$("topLogin").toggle();
	if ($("topLogin").visible()) {
		if (/MSIE (5¥.5|6)/.test(navigator.userAgent)) {
			IEPNGFix.tileBG($("topLogin"), "/img/common/bg_login.png", true);
		}
		loginButtonImageIntervalId = setInterval("sleepUntilLoginButtonImageLoad()", 100);
	} else {
		$("topLoginButton").src = "/img/common/unav_login.gif";
	}
}
function sleepUntilLoginButtonImageLoad() {
	var image = new Image();
	image.src = loginButtonImageSrc;
	
	if (image.width) {
		clearInterval(loginButtonImageIntervalId);
		changeLoginButtonImage();
	}
}
function changeLoginButtonImage() {
	$("topLoginButton").src = loginButtonImageSrc;
}