var image_list1 = [

	// <image path>

	'/rsc/img/sort/sort_random1_01.jpg',
	'/rsc/img/sort/sort_random1_02.jpg',
	'/rsc/img/sort/sort_random1_03.jpg',
	'/rsc/img/sort/sort_random1_04.jpg'
];

var image_list2 = [

	// <image path>

	'/rsc/img/sort/sort_random2_01.jpg',
	'/rsc/img/sort/sort_random2_02.jpg',
	'/rsc/img/sort/sort_random2_03.jpg'
];

var rdm_image1 = Math.round(Math.random()*(image_list1.length-1));
var rdm_image2 = Math.round(Math.random()*(image_list2.length-1));

document.getElementById("random1").style.background = "transparent url("+image_list1[rdm_image1]+") no-repeat scroll right top";
document.getElementById("random2").style.background = "transparent url("+image_list2[rdm_image2]+") no-repeat scroll right top";

function blur() {
	document.getElementById("nav1").src = "/rsc/img/sort/sort_nav1.jpg";
	document.getElementById("nav2").src = "/rsc/img/sort/sort_nav2.jpg";
	document.getElementById("nav3").src = "/rsc/img/sort/sort_nav3.jpg";
	document.getElementById("nav4").src = "/rsc/img/sort/sort_nav4.jpg";
	document.getElementById("nav5").src = "/rsc/img/sort/sort_nav5.jpg";
}
function focus_1() {
	blur();
	document.getElementById("nav1").src = "/rsc/img/sort/sort_nav1_over.jpg";
}

function focus_2() {
	blur();
	document.getElementById("nav2").src = "/rsc/img/sort/sort_nav2_over.jpg";
}
function focus_3() {
	blur();
	document.getElementById("nav3").src = "/rsc/img/sort/sort_nav3_over.jpg";
}
function focus_4() {
	blur();
	document.getElementById("nav4").src = "/rsc/img/sort/sort_nav4_over.jpg";
}
function focus_5() {
	blur();
	document.getElementById("nav5").src = "/rsc/img/sort/sort_nav5_over.jpg";
}