// mouseover an image
function jsfMouseOver(imgObj) {
  dot = imgObj.src.lastIndexOf(".");
  imgObj.src = "" + imgObj.src.substring(0, dot) + "+" + imgObj.src.substring(dot, imgObj.src.length);
}

// mouseout an image
function jsfMouseOut(imgObj) {
  dot = imgObj.src.lastIndexOf(".");
  imgObj.src = "" + imgObj.src.substring(0, dot-1) + imgObj.src.substring(dot, imgObj.src.length);
}