img1_on = new Image(154,57); 
img1_on.src="images/design/fbox1over.gif"; 
img1_off = new Image(154,57); 
img1_off.src="images/design/fbox1.gif"; 

img2_on = new Image(154,57); 
img2_on.src="images/design/fbox2over.gif"; 
img2_off = new Image(154,57); 
img2_off.src="images/design/fbox2.gif"; 

img3_on = new Image(154,57); 
img3_on.src="images/design/fbox3over.gif"; 
img3_off = new Image(154,57); 
img3_off.src="images/design/fbox3.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"); 
    }