// GLOBAL VARIABLES //

var pathToImages =	"/images/";
var thisPage = 		0;
var suffix =		".gif";
var displayStatus = 	true;
var able =		document.images;
var statusLinePrefix =	"";

	// NAMES OF IMAGES //
	
var filenames = new Array();
filenames[1] = 		"assignments";
filenames[2] = 		"news";
filenames[3] = 		"notes";
filenames[4] = 		"handouts";
filenames[5] = 		"labs";
filenames[6] = 		"resources";
filenames[7] = 		"boards";

	// STATUS LINE MESSAGES //
	
var statusLine = new Array();
statusLine[1] = 	"Homework & Assignments for this Course";
statusLine[2] = 	"Daily News from our Class";
statusLine[3] = 	"Powerpoint Lectures from our Class";
statusLine[4] = 	"Handouts & Worksheets for this Course";
statusLine[5] = 	"Labs for this Course";
statusLine[6] = 	"Helpful Resources for You!";
statusLine[7] = 	"Got a Question?  Ask it on the Bulletin Boards";

	// PRELOADS IMAGES //

if (able) {
	for (i = 1; i < filenames.length; i++) {
		eval("var " + filenames[i] + "off = new Image();");
		eval(filenames[i] + "off.src = '" + pathToImages + "nav_top_" + filenames[i] + "-off" + suffix + "'");
	}
	for (i = 1; i < filenames.length; i++) {
		eval("var " + filenames[i] + "on = new Image();");
		eval(filenames[i] + "on.src = '" + pathToImages + "nav_top_" + filenames[i] + "-on" + suffix + "'");
	}
	var tempImage = new Image();
}

	// CHANGES IMAGES //

function changeImages(linkNo, onOrOff) {
	if (able) {
		if (linkNo != thisPage) {
			eval("document.images['" + filenames[linkNo] + "'].src = " + filenames[linkNo] + onOrOff + ".src");
		}
	}
	if (displayStatus) {
		if (onOrOff == "on") {
			window.status = statusLinePrefix + statusLine[linkNo];
		} else {
			window.status = "";
		}
	}
}