function doPreload() {

	var images = new Array('http://earthandspace.ucla.edu/essso/images/menu_01.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_01_hov.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_02.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_02_hov.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_03.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_03_hov.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_04.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_04_hov.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_05.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_05_hov.jpg',
				'http://earthandspace.ucla.edu/essso/images/menu_06.jpg',
				'http://earthandspace.ucla.edu/essso/images/title_l.jpg',
				'http://earthandspace.ucla.edu/essso/images/title_r.jpg',
				'http://earthandspace.ucla.edu/essso/images/title_r_hov.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/title_l_s.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/title_r_s_1.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/title_r_s_2.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_01.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_01_hov.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_02.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_02_hov.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_03.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_03_hov.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_04.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_04_hov.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_05.jpg',
				'http://earthandspace.ucla.edu/essso/symposium/images/menu_s_05_hov.jpg',
				'http://earthandspace.ucla.edu/essso/images/topo.jpg');
	preloadImages(images);
}

function preloadImages(images_array) {

	var i, j, thisimage;
	j = images_array.length;
	
	for (i=0;i<j;i++) {
		thisimage = new Image();
		thisimage.src = images_array[i];
	}
}