<!--

if(document.images)  {                
img1off = new Image();          
img1off.src = "images/b_about.gif";

img1on = new Image();          
img1on.src = "images/b_about_.gif";


img2off = new Image();          
img2off.src = "images/b_submit.gif";

img2on = new Image();          
img2on.src = "images/b_submit_.gif"; 

  
img3off = new Image();          
img3off.src = "images/b_contact.gif"; 

img3on = new Image();          
img3on.src = "images/b_contact_.gif";  

img4off = new Image();          
img4off.src = "images/b_help.gif"; 

img4on = new Image();          
img4on.src = "images/b_help_.gif";  

}

function img_act(imgName) {

if(document.images)  {

   imgOn = eval(imgName + "on.src");
   
   document[imgName].src = imgOn;

   
}
}
function img_inact(imgName) {

if (document.images)  {

  imgOff = eval(imgName + "off.src");

  document[imgName].src = imgOff;


}

}

-->