function popup() {
	//create elements
	var backgroundDiv = document.createElement("div");
	var messageDiv = document.createElement("div");
	
	//add css ids
	backgroundDiv.setAttribute("id", "backgroundpopup");
	messageDiv.setAttribute("id", "messagepopup");

	//change background color
	backgroundDiv.style.backgroundColor = "#000000";
	
	//append elements
	document.body.appendChild(backgroundDiv);
	document.body.appendChild(messageDiv);
	
	//make visible, resize to window
	messageDiv.style.display = "none";
	backgroundDiv.style.display = "block";
	backgroundDiv.style.height = document.body.clientHeight + "px";
	backgroundDiv.style.width = document.body.clientWidth + "px";
	
	//add message
	messageDiv.innerHTML = "<img src='images/logo.gif' width='250' height='105' alt='Signal Timing Manual' style='float:none' /><p style='color:white'> <a href='The_Signal_Timing_Manual_08082008.pdf' style='color:#86d1f4'>Download the Signal Timing Manual</a> (7.2mb)</p><p style='font-size:80%;line-height:1.5;width:400px'>To save the file, you may need to right click the link above and choose \"Save Target As&hellip;\".</p><p><a href='javascript:onclick=popdown();'><img src='images/dismiss.png' width='100' height='33' alt='Dismiss' /></a></p>";
	
	//make message visible
	Effect.SlideDown(document.getElementById("messagepopup"));
}
function popdown() {
	Effect.SlideUp(document.getElementById("messagepopup"));
	Effect.Fade(document.getElementById("backgroundpopup"));
	
	setTimeout("$('backgroundpopup').remove();", 1500);
	setTimeout("$('messagepopup').remove();", 1500);
}