// JavaScript Document
if (document.images) {            
img1on = new Image();           
img1on.src = "images/home_button_on.gif"; 


img1off = new Image();           
img1off.src = "images/home_button_off.gif"; 

img2on = new Image();           
img2on.src = "images/overview_button_on.gif"; 


img2off = new Image();           
img2off.src = "images/overview_button_off.gif"; 

img3on = new Image();           
img3on.src = "images/contact_sub_button2_on.gif"; 


img3off = new Image();           
img3off.src = "images/contact_sub_button2_off.gif";

img4on = new Image();           
img4on.src = "images/equalopportunities_button_on.gif"; 


img4off = new Image();           
img4off.src = "images/equalopportunities_button_off.gif"; 

function imgOn(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "on.src");        }}
                        
function imgOff(imgName) {
        if (document.images) {
            document[imgName].src = eval(imgName + "off.src");        }}
}