img0_on = new Image(115,31);
img0_on.src="images/bienfr1.gif";
img0_off = new Image(115,31);
img0_off.src="images/bienfr.gif";
  
img1_on = new Image(128,30);
img1_on.src="images/bienen1.gif";
img1_off = new Image(128,30);
img1_off.src="images/bienen.gif";

img2_on = new Image(128,30);
img2_on.src="images/bienger1.gif";
img2_off = new Image(128,30);
img2_off.src="images/bienger.gif";

function over_image(parm_name)
    {
        document[parm_name].src = eval(parm_name + "_on.src");
    }
function off_image(parm_name)
    {
        document[parm_name].src = eval(parm_name + "_off.src");
    }