一个很简单的script为啥总报错？(50分)

把一个能用的script改写为函数，在html外部调用，传递三个参数，但总
报错。请大家帮帮看一下。
//var no=3;
// snow number
//var speed=0.00001;
// smaller number moves the snow faster
//var snowflake = "fallleaf01.gif";

function slowdown(snowflake,speed,snowflake)
{
var ie4up=(document.all) ? 1:0;

var dx,xp,yp;
// coordinate and position variables
var am,stx,sty;
// amplitude and step variables
var i;
vardo
c_width,doc_height;
doc_width =do
cument.body.clientWidth;

doc_height =do
cument.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 = 0;
// set coordinate variables
xp = Math.random()*(doc_width-50);
// set position variables
yp = Math.random()*doc_height;

am = Math.random()*20;
// set amplitude variables
stx = 0.02 + Math.random()/10;
// set step variables
sty = 0.7 + Math.random();
// set step variables
if (i==0)
{
do
cument.write("<div id=/"dot"+ i +"/" style=/"POSITION: ");

do
cument.write("absolute;
Z-INDEX: "+ i +";
VISIBILITY: ");

do
cument.write("visible;
TOP: 15px;
LEFT: 15px;/"><img src=/"");

do
cument.write(snowflake + "/" border=/"0/"></div>");
}
else

{
do
cument.write("<div id=/"dot"+ i +"/" style=/"POSITION: ");

do
cument.write("absolute;
Z-INDEX: "+ i +";
VISIBILITY: ");

do
cument.write("visible;
TOP: 15px;
LEFT: 15px;/"><img src=/"");

do
cument.write(snowflake + "/" border=/"0/"></div>");

}
}

function snowIE() {
for (i=0;
i<no;
++i)
{
yp += sty;

if (yp >do
c_height-50)
{
xp = Math.random()*(doc_width-am-30);

yp = 0;

stx = 0.02 + Math.random()/10;

sty = 0.7 + Math.random();

do
c_width =do
cument.body.clientWidth;

do
c_height =do
cument.body.clientHeight;

}
dx += stx;

do
cument.all["dot"+i].style.pixelTop = yp;

do
cument.all["dot"+i].style.pixelLeft = xp + am*Math.sin(dx);

}
setTimeout("snowIE()", speed);

}
snowIE();
}

看不动

接受答案了.