function galleryswitchimg(cLargeImgName, cLargeImageID, cCaption, cCaptionID)
{

    var showObj = document.getElementById(cLargeImageID);
    showObj.src = cLargeImgName;
  
    var captionObj = document.getElementById(cCaptionID);
  captionObj.innerHTML = cCaption;
}