緩緩飄落

語法說明：

	在 var no = 10; 中修改飄落圖案所出現的數量
	在飄落圖案所出現的數量中修改圖片飄落的速度，數值越大就越慢，越小越快
	在 var falling = "飄落圖案連結網址"; 中修改您所想要使用的飄落圖案連結網址

<SCRIPT language=JavaScript> 

var no = 10; 

var speed = 50; 

var falling = "飄落圖案連結網址"; 
var ns4up = (document.layers) ? 1 : 0; 
var ie4up = (document.all) ? 1 : 0; 
var dx, xp, yp;
var am, stx, sty; 
var i, doc_width = 600, doc_height = 800; 
if (ns4up) { 
doc_width = self.innerWidth; 
doc_height = self.innerHeight; 
} else if (ie4up) { 
doc_width = document.body.clientWidth; 
doc_height = document.body.clientHeight; 
} 
dx = new Array(); 
xp = new Array(); 
yp = new Array(); 
am = new Array(); 
stx = new Array(); 
sty = new Array(); 
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=\"20\" top=\"10\" visibility=\"show\"><img src=\"" + falling + "\" border=\"0\"></layer>"); 
} else { 
document.write("<layer name=\"dot"+ i +"\" left=\"20\" top=\"10\" visibility=\"show\"><img src=\"" + falling + "\" border=\"0\"></layer>"); 
} 
} else if (ie4up) { 
if (i == 0) { 
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 10px; LEFT: 20px;\"><img src=\"" + falling + "\" border=\"0\"></div>"); 
} else { 
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 10px; LEFT: 20px;\"><img src=\"" + falling + "\" border=\"0\"></div>"); 
} } } 
function snowNS() {
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("snowNS()", speed); 
} 
function snowIE() { 
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; 
} 
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]); 
} 
setTimeout("snowIE()", speed); 
} 
if (ns4up) { 
snowNS(); 
} else if (ie4up) { 
snowIE(); 
} 
</SCRIPT>