var width=50;
var height=50;

img0_on = new Image(50,50);
img0_on.src="images/buttons/activebutton1.jpg";
img0_off = new Image(50,50);
img0_off.src="images/buttons/button1.jpg";
  
img1_on = new Image(width,height);
img1_on.src="images/buttons/activebutton2.jpg";
img1_off = new Image(width,height);
img1_off.src="images/buttons/button2.jpg";

img2_on = new Image(width,height);
img2_on.src="images/buttons/activebutton3.jpg";
img2_off = new Image(width,height);
img2_off.src="images/buttons/button3.jpg";
 
img3_on = new Image(width,height);
img3_on.src="images/buttons/activebutton4.jpg";
img3_off = new Image(width,height);
img3_off.src="images/buttons/button4.jpg"; 

img4_on = new Image(width,height);
img4_on.src="images/buttons/activebutton5.jpg";
img4_off = new Image(width,height);
img4_off.src="images/buttons/button5.jpg"; 

img5_on = new Image(width,height);
img5_on.src="images/buttons/activebutton6.jpg";
img5_off = new Image(width,height);
img5_off.src="images/buttons/button6.jpg"; 

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