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↑
Background Effects >>> Particle Field.

Illustrates movement of stars (or snow) depending on the direction of the mouse.

Add the below code to the <body> section of your page:

Select All
<center>
<script language="javascript" type="text/javascript">
<!-- Original:  Joe Lard (darg36@home.com) -->
<!-- Web Site:  http://members.home.net/darg36 -->
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
ie4 = document.all?1:0;
ns4 = document.layers?1:0;
ns5 = (document.getElementById && !document.all)?1:0;
time0ID = 0;
time1ID = 0;
time2ID = 0;
wind = 0;
w1 = w2 = -10;
v1 = v2 = -10;
x1 = x2 = -10;
y1 = y2 = -10;
xan = yan = -.25;
// emulate snow or stars? (true | false)
snow = false;  // sinewave controlled
star = true; // mouse controlled path
function wave(){ // for snow
xan = Math.sin(wind/57.3);
wind+=Math.random()*5;
if (wind>360) wind = 0;
// yan = .25 // for water
}
// for stars
function mm(e) {
if (ns5) {
xan = ((e.clientX)-csw)/csw;
yan = ((e.clientY)-csh)/csh;
}
else {
xan = (((ns4)?e.pageX:event.x)-csw)/csw;
yan = (((ns4)?e.pageY:event.y)-csh)/csh;
   }
}
function init() {
if (ns4) {
z0 = document.zen.document.z0;
z1 = document.zen.document.z1;
}
if (ns5) if (document.getElementsByTagName("*")) {
document.all = document.getElementsByTagName("*")
}
if (star) {
if (ns4 || ns5) {
window.captureEvents(Event.MOUSEMOVE);
window.onmousemove = mm;
}
document.onmousemove = mm;
}
fs=(ns4)? "":"; font-size:25px";
ret=""; tem=(ns4)? "<font size=5>":"";
for (t=1;t<sh/28;t++) {
for (u=1;u<sw/6;u++)
tem += (Math.random()>.99)? ((Math.random()>.9)? "<font size="+((Math.random()*50)+12)+"px>.</font size>":"."):" "; tem += "<BR>";
}
tem += (ns4)? "</font size>":"";
ret += "<div style='position:absolute; left:0px; top:0px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
ret += "<div style='position:absolute; left:"+(sw)+"px; top:0px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
ret += "<div style='position:absolute; left:0px; top:"+(sh)+"px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
ret += "<div style='position:absolute; left:"+(sw)+"px; top:"+(sh)+"px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
if (ns4) {
z0.document.write(ret);
z0.document.close();
}
if (ie4) z0.innerHTML = ret;
if (ns5) document.all.z0.innerHTML = ret;
ret=""; tem=(ns4)? "<font size=5>":"";
for (t = 1; t < sh / 28; t++) {
for (u = 1; u < sw / 6; u++)
tem += (Math.random()>.99)? ((Math.random()>.9)? "<font size="+((Math.random()*50)+12)+"px>.</font size>":"."):" ";
tem+="<BR>";
}
tem += (ns4)? "</font size>":"";
ret += "<div style='position:absolute; left:0px; top:0px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
ret += "<div style='position:absolute; left:"+(sw)+"px; top:0px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
ret += "<div style='position:absolute; left:0px; top:"+(sh)+"px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
ret += "<div style='position:absolute; left:"+(sw)+"px; top:"+(sh)+"px; width:"+sw+"px; height:"+sh+"px; color:blue"+fs+"; font-family:Times'>"+tem+"</DIV>";
if (ns4) {
z1.document.write(ret);
z1.document.close();
}
if (ie4) z1.innerHTML = ret;
if (ns5) {
document.all.z1.innerHTML = ret;
z0 = document.all.z0;
z1 = document.all.z1;
}
time1ID = setInterval('z1m()',33);
time0ID = setInterval('z0m()',55);
if (snow) time2ID=setInterval('wave()',77);
}
function halt() {
if (time1ID) clearInterval(time1ID);
if (time0ID) clearInterval(time0ID);
if (time2ID) clearInterval(time2ID);
}
function z0m() {
x1 -= 4 * xan;
x2 -= 4 * yan;
a = Math.round(x1);
b = Math.round(x2);
if (w1 != a) {
w1 = a;
if (w1 > 0) x1 = w1 = -sw;
if (w1 < -sw) x1 = w1 = 0;
if (!ns4) z0.style.left = w1 + "px";
}
if (w2 != b) {
w2 = b;
if (w2 > 0) x2 = w2 = -sh;
if (w2 < -sh) x2 = w2 = 0;
if (!ns4) z0.style.top = w2 + "px";
}
if (ns4) z0.moveTo(w1,w2);
}
function z1m() {
y1 -= xan;
y2 -= yan;
a1 = Math.round(y1);
b1 = Math.round(y2);
if (v1 != a1) {
v1 = a1;
if (v1 > 0) y1 = v1 = -sw;
if (v1 < -sw) y1 = v1 = 0;
if (!ns4) z1.style.left = v1 + "px";
}
if (v2 != b1) {
v2 = b1;
if (v2 > 0) y2 = v2 = -sh;
if (v2 < -sh) y2 = v2 = 0;
if (!ns4) z1.style.top = v2 + "px";
}
if (ns4) z1.moveTo(v1,v2);
}
//  End -->
</script>
<script language="javascript" type="text/javascript">

<!-- Begin
//var sw = (ie4)? document.body.offsetWidth:window.innerWidth;
//var sh = (ie4)? document.body.offsetHeight:window.innerHeight;
sw=200; sh=200; // field width and height
var csw = Math.round(sw/2);
var csh = Math.round(sh/2);
ret="<STYLE TYPE='text/css'><!--\n";
ret+="#zen {position:absolute; left:0; top:0; width:"+sw+"; height:"+sh+
"; font-size:3000px; font-family:Times; clip:rect(0,"+(sw)+","+(sh)+
",0); overflow:hidden; z-Index:0;}";
ret+="#z0 {position:absolute; left:-10; top:-10; width:"+(sw*2)+
"; height:"+(sh*2)+"; clip:rect(0,"+(sw*2)+","+(sh*2)+",0)}";
ret+="#z1 {position:absolute; left:-10; top:-10; width:"+(sw*2)+
"; height:"+(sh*2)+"; clip:rect(0,"+(sw*2)+","+(sh*2)+",0)}";
ret+="#ar {position:absolute; left:10; top:10; width:100; height:100;"+
" z-Index:1000; color:red}";
ret+="//-->\n</STYLE>";
if (ns4) ret+="<DIV id=zen>_"; else ret+="<DIV id=zen>";
ret+="<DIV id=z1></DIV>";
ret+="<DIV id=z0></DIV>";
ret+="</DIV>";
document.write(ret);
 window.onload=init;
 window.onunload=halt;
//  End -->
</script>
<DIV  id=ar><a href="javascript:halt()"> </A></DIV>
</center>

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