function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}


// Array der Textbilder
var theImages = new Array() // do not change this
var theImages2 = new Array() // do not change this
var theImages3 = new Array() // do not change this

theImages[0] = '/ioi/resources/images/random/text01.gif'
theImages[1] = '/ioi/resources/images/random/text02.gif'
theImages[2] = '/ioi/resources/images/random/text03.gif'
theImages[3] = '/ioi/resources/images/random/text04.gif'
theImages[4] = '/ioi/resources/images/random/text05.gif'
theImages[5] = '/ioi/resources/images/random/text06.gif'
theImages[6] = '/ioi/resources/images/random/text07.gif'
theImages[7] = '/ioi/resources/images/random/text08.gif'

theImages2[0] = '/ioi/resources/images/headermitarbeiter/test1.jpg'
theImages2[1] = '/ioi/resources/images/headermitarbeiter/test2.jpg'

theImages3[0] = '/ioi/resources/images/random/en_text01.gif'
theImages3[1] = '/ioi/resources/images/random/en_text02.gif'
theImages3[2] = '/ioi/resources/images/random/en_text03.gif'
theImages3[3] = '/ioi/resources/images/random/en_text04.gif'

var j = 0
var p = theImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = theImages[i]
}

var k = 0
var t = theImages2.length;
var preBuffer2 = new Array()
for (i = 0; i < t; i++){
   preBuffer2[i] = new Image()
   preBuffer2[i].src = theImages2[i]
}

var r = 0
var z = theImages3.length;
var preBuffer3 = new Array()
for (i = 0;i < z; i++){
   preBuffer3[i] = new Image()
   preBuffer3[i].src = theImages3[i]
}

var whichImage = Math.round(Math.random()*(p-1));
var whichImage2 = Math.round(Math.random()*(t-1));
var whichImage3 = Math.round(Math.random()*(z-1));

function showImage(){
	document.write('<img src="'+theImages[whichImage]+'" height="28" width="450" border="0">');
}

function showImageEn(){
	document.write('<img src="'+theImages3[whichImage3]+'" height="28" width="450" border="0">');
}

function showImage2(){
	document.getElementById('imgmitarbeiter').style.backgroundImage = "url(" + theImages2[whichImage2] + ")";
}