function changeHeadImg(i)
	{
		//var imgArr = new Array("top/1.png","top/2.png","top/3.png","top/4.png","top/5.png","top/6.png","top/7.png","top/8.png","top/9.png","top/10.png","top/11.png","top/12.png","top/13.png");
		var imgArr = new Array("top/11.png","top/15.png","top/10.png","top/13.png","top/9.png","top/7.png");
		
		var currImg = ( i < 0 ? Math.floor(Math.random()*imgArr.length) : i );
		
		var nextImg = (currImg+1 < imgArr.length ? currImg+1 : 0);
		
		top.document.getElementById("headImg").src = 'http://www.fysicon.dk/'+imgArr[currImg];
		setTransHeadImg(0);
		top.document.getElementById("headImgTD").style.backgroundImage="url('http://www.fysicon.dk/"+imgArr[nextImg]+"')";
		
		var StandByTime = 5000;
		//var StandByTime = 0;
		var FadeTime    = 2000;
		//var FadeTime    = 500;
		var FadeSteps   = 25;
		
		setTimeout("fadeOutHeadImg("+FadeTime+","+FadeSteps+")",StandByTime);
		setTimeout("top.document.getElementById('headImg').src='http://www.fysicon.dk/"+imgArr[nextImg]+"';",StandByTime+FadeTime);
		setTimeout("changeHeadImg("+nextImg+")",StandByTime+FadeTime+100);
	}
	
	function fadeOutHeadImg(time,steps)
	{
		for (var j=1; j<=steps; j++)
		{
			setTimeout("setTransHeadImg("+(j*(100/steps))+")",(time/steps)*j);
		}
	}
	
	function setTransHeadImg(opac)
	{
		top.document.getElementById('headImg').style.opacity = 1-(opac/100);
		top.document.getElementById('headImg').style.filter="alpha(opacity="+(100-opac)+")";
	}