// JavaScript Document
// USAGE: <img src="" alt="" width="" height="" border="0" name="" id="" onmouseover="imgSwap(this)" onmouseout="imgSwap(this)" />

function imgSwap(oImg)
{
   var strOver  = "_on"    // image to be used with mouse over
   var strOff = "_off"     // normal image
   var strImg = oImg.src
   if (strImg.indexOf(strOver) != -1) 
      oImg.src = strImg.replace(strOver,strOff)
   else
      oImg.src = strImg.replace(strOff,strOver)
}