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Hola,

Código:
Código:
<!DOCTYPE html>
<html>
<head>
  <title>Ejemplo de javascript</title>
  <meta charset="UTF-8">
</head>
<body>
<!-- Presentado por javascripts-gratis.de -->
<script type='text/javascript'> <!--
Image0 = new Image(); 
Image0.src = "bubbles.gif"; 
Amount = 20; 
Ymouse = -50; 
Xmouse = -50; 
Ypos = new Array(); 
Xpos = new Array(); 
Speed = new Array(); 
rate = new Array(); 
grow = new Array(); 
Step = new Array(); 
Cstep = new Array(); 
nsSize = new Array(); 
ns = (document.layers)?1:0; 
(document.layers)?window.captureEvents(Event.MOUSEMOVE):0;
function Mouse(e) {
Ymouse=(e)?e.pageY-20:window.event.y-20;
Xmouse=(e)?e.pageX:window.event.x;
}
(document.layers)?window.onMouseMove=Mouse:document.onmousemove=Mouse;
for (i = 0; i < Amount; i++) {
Ypos[i] = Ymouse;
Xpos[i] = Xmouse;
Speed[i] = Math.random()*4+1;
Cstep[i] = 0;
Step[i] = Math.random()*0.1+0.05;
grow[i] = 8;
nsSize[i] = Math.random()*15+5;
rate[i] = Math.random()*0.5+0.1;
}
if (ns) {
for (i = 0; i < Amount; i++) {
document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0><img src="+Image0.src+" name='N' width="+nsSize[i]+" height="+nsSize[i]+"></LAYER>");
   }
}
else {
document.write('<div style="position:absolute;top:0px;left:0px"><div style="position:relative">');
for (i = 0; i < Amount; i++) {
document.write('<img id="si'+i+'" src="'+Image0.src+'" style="position:absolute;top:0px;left:0px;filter:alpha(opacity=90);">');
}
document.write('</div></div>');
}
function MouseBubbles() {
var hscrll = (document.layers)?window.pageYOffset:document.documentElement.scrollTop;
var wscrll = (document.layers)?window.pageXOffset:document.documentElement.scrollLeft;
for (i = 0; i < Amount; i++){
sy = Speed[i] * Math.sin(270 * Math.PI / 180);
sx = Speed[i] * Math.cos(Cstep[i] * 4);
Ypos[i] += sy;
Xpos[i] += sx; 
if (Ypos[i] < -40) {
Ypos[i] = Ymouse;
Xpos[i] = Xmouse;
Speed[i] = Math.random() * 6 + 4;
grow[i] = 8;
nsSize[i] = Math.random() * 15 + 5;
}
if (ns) {
document.layers['sn'+i].left = Xpos[i] + wscrll;
document.layers['sn'+i].top = Ypos[i] + hscrll;
}
else {
document.getElementById('si'+i).style.left = Xpos[i] + wscrll+"px";
document.getElementById('si'+i).style.top = Ypos[i] + hscrll+"px";
document.getElementById('si'+i).style.width = grow[i]+"px";
document.getElementById('si'+i).style.height = grow[i]+"px";
}
grow[i] += rate[i]; 
Cstep[i] += Step[i];
if (grow[i] > 24) grow[i] = 25;
}
setTimeout('MouseBubbles()', 10);
}
//-->
</script>
<!-- Presentado por javascripts-gratis.de --><br />
<script type="text/javascript">MouseBubbles();</script>
</body>
</html>
Página web: https://drive.google.com/open?id=1i49I75G8VWgWh5rid3Gljb5dvt7rIkCc

Saludos