if (document.images) 
   										{

   aoff = new Image();						// Inactive button images
   aoff.src ="../images/anim/leftarrow_static_blink.gif";
   boff = new Image();
   boff.src ="../images/anim/rightarrow_static_blink.gif";   

   aon = new Image();						// Active button images
   aon.src ="../images/anim/leftarrow_walk_noblink.gif";
   bon = new Image();
   bon.src ="../images/anim/rightarrow_walk_noblink.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");
       									}
   										}