var snowsrc="js/snow.gif" 
var no = 10; 

var ns4 = (document.layers) ? 1 : 0;  
var ie = (document.all ) ? 1 : 0; 
var dom = (document.getElementById && !document.all) ? 1 : 0; 

var dx, xp, yp;  
var am, stx, sty;  
var i; 
var doc_width = screen.availWidth; 
var doc_height = screen.availHeight; 


if (ns4) 
{ doc_width = self.innerWidth; 
doc_height = self.innerHeight; } 
else if (ie) 
{ doc_width = document.body.clientWidth; 
doc_height = document.body.clientHeight; } 
else if (dom) 
{ 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 (ns4)  
{  
if (i == 0) 
{ document.write("<layer name='dot"+ i +"' left='-20' top='-20' visibility='show'><img src='"+snowsrc+"' border='0'></layer>"); } 
else 
{ document.write("<layer name='dot"+ i +"' left='-20' top='-20' visibility='show'><img src='"+snowsrc+"' border='0'></layer>"); } 
} 
else if (ie) 
{ 
if (i == 0) 
{ document.write("<div id='dot"+ i +"' style='position:absolute; z-index:"+ i +"; visibility:visible; top:-20px; left:-20px;'><img src='"+snowsrc+"' border='0'></div>"); }  
else  
{ document.write("<div id='dot"+ i +"' style='position:absolute; z-index:"+ i +"; visibility:visible; top:-20px; left:-20px;'><img src='"+snowsrc+"' border='0'></div>"); } 
} 
else if (dom) 
{ 
if (i == 0) 
{ document.write("<div id='dot"+ i +"' style='position:absolute; z-index:"+ i +"; visibility:visible; top:-20px; left:-20px;'><img src='"+snowsrc+"' border='0'></div>"); }  
else  
{ document.write("<div id='dot"+ i +"' style='position:absolute; z-index:"+ i +"; visibility:visible; top:-20px; left:-20px;'><img src='"+snowsrc+"' border='0'></div>"); } 
} 
} 

function snowNS4() {  
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("snowNS4()", 10); 
} 

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()", 10); 
} 

function snowDOM() { 
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.getElementById("dot"+i).style.top = yp[i];  
document.getElementById("dot"+i).style.left = xp[i] + am[i]*Math.sin(dx[i]);  
} 
setTimeout("snowDOM()", 10); 
} 

if (ns4) 
{ snowNS4(); } 
else if (ie) 
{ snowIE(); } 
else if (dom) 
{ snowDOM(); }