javascript 눈 내리게 하기 소스

<script type="text/javascript">
////////////////////////////////////////////////
// Javascript made by http://peters1.dk/tools //
////////////////////////////////////////////////

// REMEMBER: To change the path, where snow.gif is saved...
snow_img = "http://www.domain.com/snow.gif";

// EXTRA: You can adjust the numbers of snowflakes you want on each page...
snow_no = 15;

if (typeof(window.pageYOffset) == "number")
{
	snow_browser_width = window.innerWidth;
	snow_browser_height = window.innerHeight;
} 
else if (document.body && (document.body.scrollLeft || document.body.scrollTop))
{
	snow_browser_width = document.body.offsetWidth;
	snow_browser_height = document.body.offsetHeight;
}
else if (document.documentElement && (document.documentElement.scrollLeft || document.documentElement.scrollTop))
{
	snow_browser_width = document.documentElement.offsetWidth;
	snow_browser_height = document.documentElement.offsetHeight;
}
else
{
	snow_browser_width = 500;
	snow_browser_height = 500;	
}

snow_dx = [];
snow_xp = [];
snow_yp = [];
snow_am = [];
snow_stx = [];
snow_sty = [];

for (i = 0; i < snow_no; i++) 
{ 
	snow_dx[i] = 0; 
	snow_xp[i] = Math.random()*(snow_browser_width-50);
	snow_yp[i] = Math.random()*snow_browser_height;
	snow_am[i] = Math.random()*20; 
	snow_stx[i] = 0.02 + Math.random()/10;
	snow_sty[i] = 0.7 + Math.random();
	if (i == 0) document.write("<\div id=\"snow_flake0\" style=\"position:absolute;z-index:0\"><a href=\"http://peters1.dk/tools\" target=\"_blank\"><\img src=\""+snow_img+"\" border=\"0\"></a><\/div>");
	else document.write("<\div id=\"snow_flake"+ i +"\" style=\"position:absolute;z-index:"+i+"\"><\img src=\""+snow_img+"\" border=\"0\"><\/div>");
}

function SnowStart() 
{ 
	for (i = 0; i < snow_no; i++) 
	{ 
		snow_yp[i] += snow_sty[i];
		if (snow_yp[i] > snow_browser_height-50) 
		{
			snow_xp[i] = Math.random()*(snow_browser_width-snow_am[i]-30);
			snow_yp[i] = 0;
			snow_stx[i] = 0.02 + Math.random()/10;
			snow_sty[i] = 0.7 + Math.random();
		}
		snow_dx[i] += snow_stx[i];
		document.getElementById("snow_flake"+i).style.top=snow_yp[i]+"px";
		document.getElementById("snow_flake"+i).style.left=snow_xp[i] + snow_am[i]*Math.sin(snow_dx[i])+"px";
	}
	snow_time = setTimeout("SnowStart()", 10);
}
SnowStart();
</script>