var topcurrentbox = "";

function toproll (toprollbox) {
	var topon = document.getElementById(toprollbox + "_on");
	var topoff = document.getElementById(toprollbox + "_off");
	topoff.style.display = "none";
	topon.style.display = "block";
}

function topunroll (toprollbox) {
	if (toprollbox != topcurrentbox) {
		var topon = document.getElementById(toprollbox + "_on");
		var topoff = document.getElementById(toprollbox + "_off");
		topon.style.display = "none";
		topoff.style.display = "block";
	}
}


function topcurrent (toprollbox) {
	topcurrentbox = toprollbox;
	toproll(toprollbox);
}