// JavaScript Document

var snowenable = true;

var no = 25; // snow number
var speed = 10; // smaller number moves the snow faster
var snowflake = "snow.gif";

var ns4up = (document.layers) ? 1 : 0; // browser sniffer
var ie4up = (document.all) ? 1 : 0;
var ns6=(document.getElementById && !document.all);
var dx, xp, yp; // coordinate and position variables
var am, stx, sty; // amplitude and step variables
var i, doc_width = 800, doc_height = 600;

if (ns4up) {
	doc_width = self.innerWidth;
	doc_height = self.innerHeight;
} else if (ie4up || ns6) {
	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*snowenable; ++i) { 
	dx[i] = 0; // set coordinate variables
	xp[i] = Math.random()*(doc_width-50); // set position variables
	yp[i] = Math.random()*doc_height;
	am[i] = Math.random()*20; // set amplitude variables
	stx[i] = 0.02 + Math.random()/10; // set step variables
	sty[i] = 0.7 + Math.random(); // set step variables

	if (ns4up) {// set layers
		if (i == 0) {
			document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
			document.write("top=\"15\" visibility=\"show\"><img src=\"/features/snow/");
			document.write(snowflake + "\" border=\"0\"></layer>");
		} else {
			document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
			document.write("top=\"15\" visibility=\"show\"><img src=\"/features/snow/");
			document.write(snowflake + "\" border=\"0\"></layer>");
		}
	} else if (ie4up || ns6) {
		if (i == 0) {
			document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
			document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
			document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"/features/snow/");
			document.write(snowflake + "\" border=\"0\"></div>");
		} else {
			document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
			document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
			document.write("visible; TOP: 15px; LEFT: 15px;\"><img src=\"/features/snow/");
			document.write(snowflake + "\" border=\"0\"></div>");
		}
	}
}

function snowNS() { // Netscape main animation function
	for (i = 0; i < no; ++ i) { // iterate for every dot
		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() { // IE main animation function
	for (i = 0; i < no; ++ i) { // iterate for every dot
		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.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 (snowenable){
	if (ns4up) {snowNS()} else if (ie4up || ns6) {snowIE()}
}