if(top != self) top.location.href = location.href;

// preload nav images
img1 = new Image();
img1.src = "images/home_cur.jpg";
img2 = new Image();
img2.src = "images/about_cur.jpg";
img3 = new Image();
img3.src = "images/tips_cur.jpg";
img4 = new Image();
img4.src = "images/message_cur.jpg";

function topnav_over(category) {

	if (document.getElementById) document.getElementById(category).src = "images/" + category + "_cur.jpg";
	else document[category].src = "images/" + category + "_cur.jpg";
}

function topnav_out(category) {
	
	if (document.getElementById) document.getElementById(category).src = "images/" + category + ".jpg";
	else document[category].src = "images/" + category + "_cur.jpg";
}	

function blank() {}