//
// global variables
//
var currentid;

var home_on, home_off;
home_on = new Image();
home_on.src = 'images/menu_home_on.gif';
home_off = new Image();
home_off.src = 'images/menu_home_off.gif';

var books_on, books_off;
books_on = new Image();
books_on.src = 'images/menu_books_on.gif';
books_off = new Image();
books_off.src = 'images/menu_books_off.gif';

var blogs_on, blogs_off;
blogs_on = new Image();
blogs_on.src = 'images/menu_blogs_on.gif';
blogs_off = new Image();
blogs_off.src = 'images/menu_blogs_off.gif';

var keynotes_on, keynotes_off;
keynotes_on = new Image();
keynotes_on.src = 'images/menu_keynotes_on.gif';
keynotes_off = new Image();
keynotes_off.src = 'images/menu_keynotes_off.gif';

var bio_on, bio_off;
bio_on = new Image();
bio_on.src = 'images/menu_bio_on.gif';
bio_off = new Image();
bio_off.src = 'images/menu_bio_off.gif';

var schedule_on, schedule_off;
schedule_on = new Image();
schedule_on.src = 'images/menu_schedule_on.gif';
schedule_off = new Image();
schedule_off.src = 'images/menu_schedule_off.gif';

var contact_on, contact_off;
contact_on = new Image();
contact_on.src = 'images/menu_contact_on.gif';
contact_off = new Image();
contact_off.src = 'images/menu_contact_off.gif';


//
// roll over
//
function rollover( id )
{
	var letter = id.charAt(0);
	var number = id.charAt(1);	

	var temp = eval(id + '_on').src
	document.getElementById(id).src = temp;
}

//
// roll out
//
function rollout( id )
{
	var letter = id.charAt(0);
	var number = id.charAt(1);

	var temp = eval(id + '_off').src
	document.getElementById(id).src = temp;
}

//
// load nav
//
function loadnav()
{
	if (currentid == '')
		return;	

	var temp1 = eval(currentid + '_on').src
	document.getElementById(currentid).src = temp1;

	var temp2 = eval(currentid + '_off');
	temp2.src = 'images/menu_' + currentid + '_on.gif';
}