var no = 10 ;
var speed = 13 ;
var snowflake = new Array("http://img.tw.cyworld.com/n_image/item/effect/080327/hana_01.gif", 
"http://img.tw.cyworld.com/n_image/item/effect/080327/hana_01.gif","http://img.tw.cyworld.com/n_image/item/effect/080327/hana_01.gif");


var showtimmer = '';
var ns4up = (document.layers) ? 1 : 0;
var ie4up = (document.all) ? 1 : 0;
var dx, xp, yp;    
var am, stx, sty;  
var i, doc_width = 600, doc_height = 400;
dx = new Array();
xp = new Array();
yp = new Array();
am = new Array();
stx = new Array();
sty = new Array();
//window.onload = init_heart;
//function init_heart() {
if (ns4up) {
	doc_width = self.innerWidth;
	doc_height = self.innerHeight;
} else if (ie4up) {
	doc_width = document.body.clientWidth;
	doc_height = document.body.clientHeight;
}

for (i = 0; i < no; ++ i) {
	seed_val = Math.round(Math.random()*2);
	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 (ns4up) {
		document.write("<layer name=\"dot"+ i +"\" left=\"15\" ");
		document.write("top=\"15\" visibility=\"show\"><img src=\"");
		document.write(snowflake + "\" border=\"0\"></layer>");
	} else if (ie4up) {
		//document.write("<div id=\"dot"+ i +"\" style=\"POSITION:absolute; Z-INDEX: "+ i +"; VISIBILITY:visible; TOP: 15px; LEFT: 15px;\"><img src=\"" + snowflake[seed_val] + "\" border=\"0\"></div>");
		document.body.insertAdjacentHTML("AfterBegin", "<div id=\"dot"+ i +"\" style=\"POSITION:absolute; Z-INDEX: "+ i +"; VISIBILITY:visible; TOP: 15px; LEFT: 15px;\"><img src=\"" + snowflake[seed_val] + "\" border=\"0\"></div>");
	}
}
if (ns4up)
	snowNS();
else if (ie4up)
	snowIE();
//}


function snowNS() {
	for (i = 0; i < no; ++ i) {
		yp[i] += sty[i];
		if (yp[i] > doc_height) {
			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]);
	}
	showtimmer = setTimeout("snowNS()", speed);
}

function snowIE() {  // IE main animation function
	for (i = 0; i < no; ++ i) {
		yp[i] += sty[i];
		if (yp[i] > doc_height-10) {
			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.pixelTop = yp[i];
		document.getElementById("dot"+i).style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i]);
	}
	showtimmer = setTimeout("snowIE()", speed);
}