Raining Effect

<SCRIPT LANGUAGE="JavaScript">
/*
Script by Matthew Musgrove (http://free.prohosting.com/~musgrove)
For this script and more,
visit http://java-scripts.net
or http://wsabstract.com
*/


<!-- Begin
var no = 50;
var speed = 1;
var ns4up = (document.layers) ? 1 : 0;
var ie4up = (document.all) ? 1 : 0;
var s, x, y, sn, cs;
var a, r, cx, cy;
var i, doc_width = 800, doc_height = 600;

if (ns4up) {
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}
else

if (ie4up) {
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}

x = new Array();
y = new Array();
r = new Array();
cx = new Array();
cy = new Array();
s = 8;

for (i = 0; i < no; ++ i) {
initRain();

if (ns4up) {

if (i == 0) {
document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
document.write("top=\"1\" visibility=\"show\"><font color=\"blue\">");
document.write(",</font></layer>");

}
else {
document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
document.write("top=\"1\" visibility=\"show\"><font color=\"blue\">");
document.write(",</font></layer>");
}
}
else

if (ie4up) {

if (i == 0) {
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
document.write("visible; TOP: 15px; LEFT: 15px;\"><font color=\"blue\">");
document.write(",</font></div>");
}

else {
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
document.write("visible; TOP: 15px; LEFT: 15px;\"><font color=\"blue\">");
document.write(",</font></div>");
}
}
}

function initRain() {
a = 6;
r[i] = 1;
sn = Math.sin(a);
cs = Math.cos(a);
cx[i] = Math.random() * doc_width + 1;
cy[i] = Math.random() * doc_height + 1;
x[i] = r[i] * sn + cx[i];
y[i] = cy[i];
}

function makeRain() {
r[i] = 1;
cx[i] = Math.random() * doc_width + 1;
cy[i] = 1;
x[i] = r[i] * sn + cx[i];
y[i] = r[i] * cs + cy[i];
}

function updateRain() {
r[i] += s;
x[i] = r[i] * sn + cx[i];
y[i] = r[i] * cs + cy[i];
}

function raindropNS() {
for (i = 0; i < no; ++ i) {

updateRain();

if ((x[i] <= 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
doc_width = self.innerWidth;
doc_height = self.innerHeight;
}

document.layers["dot"+i].top = y[i];
document.layers["dot"+i].left = x[i];

}

setTimeout("raindropNS()", speed);

}

function raindropIE() {

for (i = 0; i < no; ++ i) {
updateRain();

if ((x[i] <= 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight;
}

document.all["dot"+i].style.pixelTop = y[i];
document.all["dot"+i].style.pixelLeft = x[i];

}

setTimeout("raindropIE()", speed);

}

if (ns4up) {
raindropNS();
}

else
if (ie4up) {
raindropIE();
}

// End -->
</script>