//  Browser check
	if (navigator.appName.indexOf('Microsoft') >= 0 && navigator.appVersion.indexOf('3.') >=0) {
		okbrowser = false;
		}
	else {
		okbrowser = true;
		}
	//  Load images
	imag = new Array();
			imag[0]="images/nav/nav_aboutus_1.gif";
			imag[1]="images/nav/nav_authors_1.gif";
			imag[2]="images/nav/nav_books_1.gif";
			imag[3]="images/nav/nav_cartbar_add_1.gif";
			imag[4]="images/nav/nav_cartbar_check_1.gif";
			imag[5]="images/nav/nav_cartbar_view_1.gif";
			imag[6]="images/nav/nav_contact_1.gif";
			imag[7]="images/nav/nav_events_1.gif";
			imag[8]="images/nav/nav_search_1.gif";
			imag[9]="images/nav/nav_submissions_1.gif";

	im = new Array()
	if(document.images) {
		for (var i = 0; i < imag.length; i++) {
			im[i] = new Image();
			im[i].src = imag[i];
			}
		}
//  Mouseover functions
function on(s,i) {
	if (okbrowser) {
			if (i != null) {
				document.images[s].src= "images/nav/nav_" + i + "_1.gif";
			} else {
				document.images[s].src= "images/nav/nav_" + s + "_1.gif";
			}
		}
	}

function off(s,i) {
	if (okbrowser) {
		if (i != null) {
				document.images[s].src= "images/nav/nav_" + i + "_0.gif";
			} else {
				document.images[s].src= "images/nav/nav_" + s + "_0.gif";
			}
		}
	}