setTimeout("switchUpdateImages()", 1000);
var opacity = 100;
var f1;
var f2;
var f3;

function showConAgBig() {
	document.getElementById("conAgBig").style.visibility = "visible";
}

function hideConAgBig() {
	document.getElementById("conAgBig").style.visibility = "hidden";
}

function switchUpdateImages()
{
    if (!f1)
    {
        f1 = document.getElementById("fade3");
    }
    if (f1.id == "fade1")
    {
        f1 = document.getElementById("fade2");
        f2 = document.getElementById("fade3");
        document.getElementById("fade1").style.display = "none";
    } 
    else if (f1.id == "fade2")
    {
        f1 = document.getElementById("fade3");
        f2 = document.getElementById("fade1");
        document.getElementById("fade2").style.display = "none";
    }
    else if (f1.id == "fade3")
    {
        f1 = document.getElementById("fade1");
        f2 = document.getElementById("fade2");
        document.getElementById("fade3").style.display = "none";
    }
    f1.style.display = "block";
    f2.style.display = "block";
    opacity = 100;
    setTimeout("updateImages()", 100);
}

function updateImages() {
	step = 2;

	//internet explorer
	f1.style.filter = "alpha(opacity=" + opacity + ")"; 
	f2.style.filter = "alpha(opacity=" + ((opacity - 100) * -1) + ")";

	//firefox
	f1.style.opacity = opacity / 100;
	f2.style.opacity = (opacity - 100) * -1 / 100;

    opacity -= step;

	if (opacity == 0) 
	{
		setTimeout("switchUpdateImages()", 4000);
	} else {
		setTimeout("updateImages()", 100);
	}
}