var imageNumber = 1;
var alpha = 100;

function transition()
{
    if (alpha >= 100)
    {
        switchImage();
    }
    else
        increaseAlpha();

}
function switchImage()
{
    home_MainBackImg.style.backgroundImage = "url(./img/home/main_img"+imageNumber+".jpg)";
    imageNumber ++;
    if (imageNumber > 5) imageNumber = 1;
    home_MainFrontImg.style.backgroundImage = "url(./img/home/main_img"+imageNumber+".jpg)";
    home_MainFrontImg.style.filter = "alpha(opacity=0)";
    home_MainFrontImg.style.opacity = 0;
    alpha = 0;
    setTimeout("transition()", 4000);
}
function increaseAlpha()
{
    alpha+=2;
    home_MainFrontImg.style.filter = "alpha(opacity="+alpha+")";
    home_MainFrontImg.style.opacity = alpha/100.0;
    setTimeout("transition()", 20);
}
function setOver(id,nameon)
{
    if (document.getElementById)
    {
        imgElem = document.getElementById(id);
        imgElem.style.backgroundImage = "url(" + nameon + ")";
    }
}