if (document.images)
{
	var who0 = new Image();
	who0.src  = "images/imgHomeWhoOff.gif";
	var who1 = new Image();
	who1.src  = "images/imgHomeWhoOn.gif";
	var what0 = new Image();
	what0.src = "images/imgHomeWhatOff.gif";
	var what1 = new Image();
	what1.src = "images/imgHomeWhatOn.gif";
	var how0 = new Image();
	how0.src = "images/imgHomeHowOff.gif";
	var how1 = new Image();
	how1.src = "images/imgHomeHowOn.gif";

}

function rollOut(imgName) 
{
    if (document.images) 
    {
        document[imgName].src = eval(imgName+"0.src");
    }
}

function rollIn(imgName)
{
    if (document.images)
    {
        document[imgName].src = eval(imgName+"1.src");
    }
}