/** Functions for mouseover image swaping **/
function mouseOver(imgObj){
  var imgSrc = imgObj.src;
  overSrc = imgSrc.replace(".jpg","_over.jpg");
  imgObj.src = overSrc;
}

function mouseOut(imgObj){
  var overSrc = imgObj.src;
  imgSrc = overSrc.replace("_over.jpg",".jpg"); 
  imgObj.src = imgSrc;
}