var snowsrc="snow.gif";
var no = 20;
var hidesnowtime = 0;
var snowdistance = "pageheight";

var ie4up = (document.all) ? 1 : 0;
var ns6up = (document.getElementById&&!document.all) ? 1 : 0;

function iecompattest() {
	return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body;
}

var dx, xp, yp;
var am, stx, sty;
var i, doc_width = 800, doc_height = 600; 

if (ns6up) {
	doc_width = self.innerWidth;
	doc_height = self.innerHeight;
}
else if (ie4up) {
	doc_width = iecompattest().clientWidth;
	doc_height = iecompattest().clientHeight;
}

dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
snowsrc=(snowsrc.indexOf("dynamicdrive.com")!=-1)? "snow.gif" : snowsrc;
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 (ie4up||ns6up) {
		document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");
	}
}

function snowIE_NS6() {
	doc_width = ns6up?window.innerWidth-10 : iecompattest().clientWidth-10;
	doc_height=(window.innerHeight && snowdistance=="windowheight")? window.innerHeight : (ie4up && snowdistance=="windowheight")?  iecompattest().clientHeight : (ie4up && !window.opera && snowdistance=="pageheight")? iecompattest().scrollHeight : iecompattest().offsetHeight;
	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();
		}
		dx[i] += stx[i];
		document.getElementById("dot"+i).style.top=yp[i]+"px";
		document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i])+"px";  
    }
	snowtimer=setTimeout("snowIE_NS6()", 10);
}

function hidesnow() {
	if (window.snowtimer) {
		clearTimeout(snowtimer);
	}
	for(i=0; i<no; i++) {
		document.getElementById("dot"+i).style.visibility="hidden";
	}
}

if(ie4up||ns6up) {
	snowIE_NS6();
	if(hidesnowtime>0) {
		setTimeout("hidesnow()", hidesnowtime*1000);
	}
}