var d = window.document;
var frontpageBanners = new Array('top_banner_01','top_banner_02','top_banner_03','top_banner_04');
var tagObj = d.getElementsByTagName("div");
for (i=0;i<tagObj.length;i++){
	if(tagObj[i].className == "frontpage_visual")
		tagObj[i].style.display = 'none';
}
var tagObj = d.getElementsByTagName("a");
for (i=0;i<tagObj.length;i++){
	if(tagObj[i].className == "pr")
		tagObj[i].style.textIndent = "-5000px";
}

for (i=0;i<100;i++){
	n1 = Math.floor(Math.random() * frontpageBanners.length);
	n2 = Math.floor(Math.random() * frontpageBanners.length);
	m = frontpageBanners[n1]
	frontpageBanners[n1] = frontpageBanners[n2];
	frontpageBanners[n2] = m;
}

d.getElementById(frontpageBanners[0]).style.display = "block";