function toggleimg(imgshow) {
  var photo=document.getElementById(imgshow);
  var thumb=document.getElementById(imgshow+"_t");


      for(i=1;i<5;i++) {
        var photoDisplay=document.getElementById("img_s"+i);
        var thumbDisplay=document.getElementById("img_s"+i+"_t");

          if(photoDisplay.style.display!=="none") {
            photoDisplay.style.display="none";
            thumbDisplay.style.display="inline";
            thumbDisplay.style.float="left";
          }
      }

    photo.style.display="inline";
    thumb.style.display="none";

}