function kontaktOver()
{
	blendimage('kontaktdiv','kontaktimg','images/kontakt_red2.PNG', 100);
}

function kontaktOut()
{
	blendimage('kontaktdiv','kontaktimg','images/kontakt2.PNG', 100);
}

function instruktor(img, text)
{
blendimage('blenddiv','blendimage', img ,500);

document.getElementById("desc").innerHTML=text;
}


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++;
    }
}

//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 + ")";
}