var no = 15;
	var speed = 3;
	STAR = new Array();
	STAR[0] = "http://logstar.realworld.jp/img/js/bubble04.png";
	STAR[1] = "http://logstar.realworld.jp/img/js/bubble01.png";
	STAR[2] = "http://logstar.realworld.jp/img/js/bubble02.png";


	var ns4up = (document.layers) ? 1 : 0;
	var ie4up = (document.all) ? 1 : 0;

	var dx, xp, yp;
	var am, stx, sty;
	var i, doc_width = 2000, doc_height = 4000;

	if (ns4up) {
	        doc_width = self.innerWidth;
	        doc_height = self.innerHeight;
	} else if (ie4up) {
	        //doc_width = document.body.clientWidth;
	        //doc_height = document.body.clientHeight;
	        doc_width = document.getElementsByTagName("html")[0].clientWidth;
			doc_height = document.getElementsByTagName("html")[0].clientHeight;
	}

	dx = new Array();
	xp = new Array();
	yp = new Array();
	am = new Array();
	stx = new Array();
	sty = new Array();
	j = 0;

	for (i = 0; i < no; ++ i) {
	dx[i] = 0;
	xp[i] = Math.random()*(doc_width-50);
	yp[i] = Math.random()*doc_height;
	am[i] = Math.random()*20;
	stx[i] = 0.02 + Math.random()/10;
	sty[i] = 0.7 + Math.random();
	if (ns4up) {
	if (i == 0) {
	document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src=\"" + STAR[j] + "\" border=\"0\"></layer>");
	} else {
	document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src=\"" + STAR[j] + "\" border=\"0\"></layer>");
	}
	} else if (ie4up) {
	if (i == 0) {
	document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +" VISIBILITY: visible; BOTTOM: 15px; RIGHT: -1500px; width:1;\"><img src=\"" + STAR[j] + "\" border=\"0\"></div>");
	} else {
	document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +" VISIBILITY: visible; BOTTOM: 15px; RIGHT: -1500px; width:1;\"><img src=\"" + STAR[j] + "\" border=\"0\"></div>");
	}
	}
	if (j == (STAR.length-1)) { j = 0; } else { j += 1; }
	}
	

function STAR_NS() {
for (i = 0; i < no; ++ i) {
yp[i] += sty[i];
if (yp[i] > doc_height-50) {
xp[i] = Math.random()*(doc_width-am[i]-30);
yp[i] = 0;
stx[i] = 0.02 + Math.random()/10;
sty[i] = 0.7 + Math.random();
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
dx[i] += stx[i];
document.layers["dot"+i].top = yp[i];
document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i]);
}
setTimeout("STAR_NS", speed);
}

function STAR_IE() {
for (i = 0; i < no; ++ i) {
yp[i] += sty[i];
if (yp[i] > doc_height-50) {
xp[i] = Math.random()*(doc_width-am[i]-30);
yp[i] = 0;
stx[i] = 0.02 + Math.random()/10;
sty[i] = 0.7 + Math.random();
//doc_width = document.body.clientWidth;
//doc_height = document.body.clientHeight;
doc_width = document.getElementsByTagName("html")[0].clientWidth;
doc_height = document.getElementsByTagName("html")[0].clientHeight;
}
dx[i] += stx[i];
//document.all["dot"+i].style.pixelTop = yp[i];
//document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
document.getElementById("dot"+i).style.top = yp[i];
document.getElementById("dot"+i).style.left = xp[i] + am[i]*Math.sin(dx[i]);
}
setTimeout("STAR_IE()", speed);
}

if (ns4up) {
 STAR_NS();
} else if (ie4up) {
 setTimeout( function() { STAR_IE();}, 3000);

}