function randomBg() {
	
	img = new Array();
	img[0] = "url(/img/index_bg_001_001.jpg)";
	img[1] = "url(/img/index_bg_001_002.jpg)";
	img[2] = "url(/img/index_bg_001_003.jpg)";
	img[3] = "url(/img/index_bg_001_004.jpg)";
	img[4] = "url(/img/index_bg_001_005.jpg)";
	img[5] = "url(/img/index_bg_001_006.jpg)";
	img[6] = "url(/img/index_bg_001_007.jpg)";
	img[7] = "url(/img/index_bg_001_008.jpg)";
	img[8] = "url(/img/index_bg_001_009.jpg)";
	img[9] = "url(/img/index_bg_001_010.jpg)";
	img[10] = "url(/img/index_bg_001_011.jpg)";
	img[11] = "url(/img/index_bg_001_012.jpg)";
	img[12] = "url(/img/index_bg_001_013.jpg)";
	img[13] = "url(/img/index_bg_001_014.jpg)";
	img[14] = "url(/img/index_bg_001_015.jpg)";
	img[15] = "url(/img/index_bg_001_016.jpg)";
	img[16] = "url(/img/index_bg_001_017.jpg)";
	img[17] = "url(/img/index_bg_001_018.jpg)";
	img[18] = "url(/img/index_bg_001_019.jpg)";
	img[19] = "url(/img/index_bg_001_020.jpg)";
	img[20] = "url(/img/index_bg_001_021.jpg)";
	img[21] = "url(/img/index_bg_001_022.jpg)";
	img[22] = "url(/img/index_bg_001_023.jpg)";
	img[23] = "url(/img/index_bg_001_024.jpg)";
	img[24] = "url(/img/index_bg_001_025.jpg)";
	img[25] = "url(/img/index_bg_001_026.jpg)";
	img[26] = "url(/img/index_bg_001_027.jpg)";
	img[27] = "url(/img/index_bg_001_028.jpg)";
	img[28] = "url(/img/index_bg_001_029.jpg)";
	img[29] = "url(/img/index_bg_001_030.jpg)";
	img[29] = "url(/img/index_bg_001_031.jpg)";
	
	n = Math.floor(Math.random()*img.length);
	
	document.getElementById('topRandom').style.backgroundImage = img[n];
}

if(window.addEventListener) {
	window.addEventListener("load", randomBg, false);
}
else if(window.attachEvent) {
	window.attachEvent("onload", randomBg);
}