function swap_image()
{
	var image = Array(
		'/img/home-01.jpg', '/img/home-02.jpg', '/img/home-03.jpg', '/img/home-04.jpg'
	);
	var img = document.getElementById('heroimage');
	for(i = 0; i < image.length; i++)
	{
		if(img.src.indexOf(image[i]) != -1)
		{
			if((i + 1) >= image.length)
			{
				i = -1;
			}
			i = i + 1;

			blendimage('herodiv', 'heroimage', image[i], 1000);
		}
	}
	
	setTimeout("swap_image()", 6000); 
}

setTimeout("swap_image()", 6000);

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 + ")";
}