下雨效果

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<BODY bgcolor=#000000>
<script language="JavaScript">
<!--
var no = 60;          
var speed = 2;        
var s, x, y, sn, cs;
var a, r, cx, cy;
var i, doc_width = 800, doc_height = 600;
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();                     
 document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
 document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
 document.write("visible; TOP: 15px; LEFT: 15px;\"><font color=\"#ffffff\">");
 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 raindrop() {
 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("raindrop()", speed);                    
}
raindrop();
-->
</script>
</BODY>
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