//	Javascript for USENIX front page
var hasImage=false;
// Check on Browser type
bName = navigator.appName;
bVer = parseInt(navigator.appVersion);
if ((bName == "Netscape" && bVer >= 3) ||
    (bName == "Mozilla" && bVer >= 5) ||
    (bName == "Microsoft Internet Explorer" && bVer >= 4)) {
    hasImage = true;
    // Create an associative array of buttons
    Buttons = new Array();
    // create buttons done in onload
    // createButtons();
}
// Create a button object
function Button(file) {
    this.img = new Image();
    this.img.src = "/graphics/" + file + ".gif";
}
function crButton(name, file) {
    Buttons[name] = new Button(file);
}
// called in body - with onload="ldButtons()"
function ldButtons() {
	if (hasImage == true) {
		crButton('default', 'descr');			
		crButton('about', 'descr_about');
		crButton('events', 'descr_events');
		crButton('mem', 'descr_mem');	
		crButton('pub', 'descr_pub');
		crButton('stu', 'descr_stu');
	}
}
function iover(name)
{
    if (hasImage == true) {
	document['descr'].src = Buttons[name].img.src;
    }
}
function iout()
{
    if (hasImage == true) {
	document['descr'].src = Buttons['default'].img.src;
    }
}