function move_in(img_name,img_src)
  {
    document[img_name].src='site_images/'+img_src;
  }
function move_out(img_name,img_src)
  {
    document[img_name].src='site_images/'+img_src;
  }
  
function move_in2(img_name,img_src)
  {
    document[img_name].src='../site_images/'+img_src;
  }
function move_out2(img_name,img_src)
  {
    document[img_name].src='../site_images/'+img_src;
  }