img1_on = new Image();
img1_on.src = "images/me_clr.jpg";
img1_off = new Image();
img1_off.src = "images/me_bw.jpg";

function img_on(imgName)
{
	imgOn = eval(imgName + "_on.src");
    document [imgName].src = imgOn;
}

function img_off(imgName)
{
	imgOff = eval(imgName + "_off.src");
    document [imgName].src = imgOff;
}