var prefix = '/images/nav_';
var suffix = '.gif';
var suffix_on = '_on.gif';
var stack = new Array();
var flag = 1 ;

function preload_each (id, mode) {
stack[stack.length] = new Image();
stack[stack.length - 1].src = prefix + id + suffix_on;
/* if (flag) { 
	alert (stack[stack.length - 1].src );
	flag = 0;}
*/
}

function preload_nav() {
// var razdels = new Array();
var razdels = ['library','memorandum','technology','reports','library','contacts'];
	for (i in razdels) {
		stack[stack.length] = new Image();
		stack[stack.length - 1].src = prefix + i + suffix_on;
	}
}

if (document.images) preload_nav();

function over (id, mode) {
if (document.images) {
	document.images['' + id].src = prefix + id + suffix_on;
}
}

function out (id, mode) {
if (document.images) {
	document.images['' + id].src = prefix + id + suffix;
}
}