function chImg(img, str) {
  document.images[img].src = str;
}


function toppic_c() {
	img = new Array();
	img[0] = "common/images/visual/top.jpg";
	img[1] = "common/images/visual/top2.jpg";
	img[2] = "common/images/visual/top3.jpg";
	img[3] = "common/images/visual/top4.jpg";
	img[4] = "common/images/visual/top5.jpg";
	img[5] = "common/images/visual/top6.jpg";
	img[6] = "common/images/visual/top7.jpg";
//	img[7] = "common/images/visual/top8.jpg";

	n = Math.floor(Math.random()*img.length);
	document.rimg.src = img[n];
}

function backToTop() {
var x1 = x2 = x3 = 0;
var y1 = y2 = y3 = 0;
if (document.documentElement) {
x1 = document.documentElement.scrollLeft || 0;
y1 = document.documentElement.scrollTop || 0;
}
if (document.body) {
x2 = document.body.scrollLeft || 0;
y2 = document.body.scrollTop || 0;
}
x3 = window.scrollX || 0;
y3 = window.scrollY || 0;
var x = Math.max(x1, Math.max(x2, x3));
var y = Math.max(y1, Math.max(y2, y3));
window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
if (x > 0 || y > 0) {
window.setTimeout("backToTop()", 25);
}
}