var snowsrc="../resim/yagis/cicek.gif";
var no = 10;

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

var ns4up, ie4up, ns6up;

function initsnow(){
	ns4up = (document.layers) ? 1 : 0;
	ie4up = (document.all) ? 1 : 0;
	ns6up = (document.getElementById&&!document.all) ? 1 : 0;
	
	if (ns4up||ns6up) {
		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;								// 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\" top=\"15\" visibility=\"show\"><img src='"+snowsrc+"' border=\"0\"><\/layer>");}
			else {document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src='"+snowsrc+"' border=\"0\"><\/layer>");}
		} else if (ie4up||ns6up) {
			if (i == 0) {document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absolute; Z-INDEX: "+ i +"; VISIBILITY: visible; TOP: 15px; LEFT: 15px;\"><img src='"+snowsrc+"' border=\"0\"><\/div>");}
			else {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 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()", 10);
}

function snowIE_NS6() {
	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 = ns6up?window.innerWidth : document.body.clientWidth;
			doc_height = ns6up?window.innerHeight : document.body.clientHeight;
		}
		dx[i] += stx[i];
		if (ie4up){
			document.all["dot"+i].style.pixelTop = yp[i];
			document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
		}
		else if (ns6up){
			document.getElementById("dot"+i).style.top=yp[i];
			document.getElementById("dot"+i).style.left=xp[i] + am[i]*Math.sin(dx[i]);
		}
	}
	setTimeout("snowIE_NS6()", 10);
}

function startsnow(ne){
	snowsrc="../resim/yagis/" + ne + ".gif";
	initsnow();
	if (ns4up) {snowNS();}
	else if (ie4up||ns6up) {snowIE_NS6();}
}