Background Effects >>> Alien Spacecraft.


		<SCRIPT 
		LANGUAGE="JavaScript">

		/* Visit http://www.yaldex.com/ for full source code

and get more free JavaScript, CSS and DHTML scripts! */


		<!-- Begin

		document.body.background="space.jpg";

		var 
		isNS =
		((navigator.appName
		==
		"Netscape")
		&&
		(parseInt(navigator.appVersion)
		>=
		4));

		var 
		pic1=document.getElementById("pic1").style;

		var 
		_all =
		'';

		var 
		_style =
		'';

		var 
		wwidth, 
		wheight;

		var 
		ydir =
		'++';

		var 
		xdir =
		'++';

		var 
		id1, 
		id2, 
		id3;

		var
		x
		=
		1;

		var
		y
		=
		1;

		var 
		x1, 
		y1;

		if(!isNS)
		{

		_all='all.';

		_style='.style';

		}

		function 
		getwindowsize()
		{

		clearTimeout(id1);

		clearTimeout(id2);

		clearTimeout(id3);

		if
		(isNS)
		{

		wwidth 
		=
		window.innerWidth
		-
		55;

		wheight 
		=
		window.innerHeight
		-
		50;

		} 
		else
		{

		wwidth 
		=
		document.body.clientWidth
		-
		55;

		wheight 
		=
		document.body.clientHeight
		-
		50;

		}

		id3 
		=
		setTimeout('randomdir()',
		20000);

		animate();

		}

		function 
		randomdir()
		{

		if
		(Math.floor(Math.random()*2))
		{

		(Math.floor(Math.random()*2))
		? 
		xdir='--': 
		xdir='++';

		} 
		else
		{

		(Math.floor(Math.random()*2))
		? 
		ydir='--': 
		ydir='++';

		}

		id2 
		=
		setTimeout('randomdir()',
		20000);

		}

		function 
		animate()
		{

		eval('x'+xdir);

		eval('y'+ydir);

		if
		(isNS)
		{

		pic1.left
		=
		x+pageXOffset;

		pic1.top
		=
		y+pageYOffset;

		} 
		else
		{

		pic1.pixelLeft
		=
		x+document.body.scrollLeft;

		pic1.pixelTop
		=
		y+document.body.scrollTop;

		}

		if
		(isNS)
		{

		if
		(parseInt(pic1.top)
		<=
		5+pageYOffset) 
		ydir =
		'++';

		if
		(parseInt(pic1.top)
		>=wheight+pageYOffset) 
		ydir =
		'--'; 
		

		if
		(parseInt(pic1.left)
		>= 
		wwidth+pageXOffset) 
		xdir =
		'--';

		if
		(parseInt(pic1.left)
		<=
		5+pageXOffset) 
		xdir =
		'++';

		} 
		else
		{

		if
		(pic1.pixelTop
		<=
		5+document.body.scrollTop) 
		ydir =
		'++';

		if
		(pic1.pixelTop
		>= 
		wheight+document.body.scrollTop) 
		ydir =
		'--';

		if
		(pic1.pixelLeft
		>= 
		wwidth+document.body.scrollLeft) 
		xdir =
		'--';

		if
		(pic1.pixelLeft
		<=
		5+document.body.scrollLeft) 
		xdir =
		'++';

		}

		id1 
		=
		setTimeout('animate()',
		30);

		}

		window.onload=getwindowsize;

		window.onresize=getwindowsize;

		//  End -->

		</script>