// SET LABEL FOR SUB-NAVIGATION
function setSubnavlabel (lab) {
	document.getElementById("subnavlabel").firstChild.nodeValue = lab;
	if (lab == activeLabel) {
		document.getElementById("subnavlabel").style.fontWeight = "bold";
		document.getElementById("ssnav1").style.visibility = "visible";
		document.getElementById("ssnav2").style.visibility = "visible";	
		document.getElementById("ssnav3").style.visibility = "visible";	
		document.getElementById("ssnav4").style.visibility = "visible";	
	}
	else {
		document.getElementById("subnavlabel").style.fontWeight = "normal";
		document.getElementById("ssnav1").style.visibility = "hidden";
		document.getElementById("ssnav2").style.visibility = "hidden";
		document.getElementById("ssnav3").style.visibility = "hidden";
		document.getElementById("ssnav4").style.visibility = "hidden";
	}
}

// ROLLOUT BUTTON
function outButton(id, imgname) {
	document.getElementById(id).src = "../image/st_" + imgname + ".gif";
	if (imgname == "subnavbox") {
		setSubnavlabel(activeLabel);
	}
	document.getElementById("sim1").style.visibility = "visible";
	document.getElementById("sim2").style.visibility = "visible";
	document.getElementById("sim3").style.visibility = "visible";	
}

// ROLLOVER BUTTON
function overButton(id, imgname) {
	document.getElementById(id).src = "../image/ac_" + imgname + ".gif";
	if (activeLabel == "Simulation" && activeLabel == "airflow" && activeLabel == "thermal" && activeLabel == "daylight" ) {
		document.getElementById("sim1").style.visibility = "hidden";
		document.getElementById("sim2").style.visibility = "hidden";
		document.getElementById("sim3").style.visibility = "hidden";
	}
	if (imgname == "subnavbox") {
		setSubnavlabel(id);
	}
}