//Ustalenie srodka ekranu i pozycji #okno w srodku, uruch animacji

	var wid = screen.width;
	wid = (wid-900)/2;
	var nazwyObr = new Array("baner900x130.png", "usfLAG22X12.png", "rondoWieczorem508x350.jpg", "GoGa350x508.JPG", "WashingtonDC508x350.JPG", "USPTClogomi.png", "GTS-logo.png", "PAEClogo.gif");	
	var tablObraz = new Array(nazwyObr.length);
	var ilObrZalad = 0;
	var semafor = 0;
	
	//funkcja onload 
	function poZalad(){		
	document.getElementById("okno").style.left = wid + "px";	//ustawienie "okno" w srodku window	
	for (var i=0; i<nazwyObr.length; i++){						//zaladowanie obrazkow
	tablObraz[i] = new Image();	
	tablObraz[i].onload = liczObr;
	 tablObraz[i].src = "ima/" + nazwyObr[i];
		}
	}
	
	function liczObr(){	
	if(++ilObrZalad == nazwyObr.length)	
	window.setInterval("anim()", 3000);		
	}
	
	function zmOkna(){
	wid = screen.width;
	wid = (wid-900)/2;
	document.getElementById("okno").style.left = wid + "px";
	}
	
	function anim(){	
	
	if(semafor==0)
	{
	document.getElementById("anim0").style.visibility = "visible";
	document.getElementById("anim1").style.visibility = "hidden";
	document.getElementById("anim2").style.visibility = "hidden";
	semafor++;
	} else if (semafor==1) {	
	document.getElementById("anim0").style.visibility="hidden";
	document.getElementById("anim1").style.visibility = "visible";
	document.getElementById("anim2").style.visibility = "hidden";
	semafor++;
	} else if (semafor==2) {	
	document.getElementById("anim0").style.visibility="hidden";
	document.getElementById("anim1").style.visibility = "hidden";
	document.getElementById("anim2").style.visibility = "visible";
	semafor=0;
	}
}