function stOvr(id, thestyle) {
  document.getElementById(id).className = thestyle;
}

function stOut(id, thestyle) {
  document.getElementById(id).className = thestyle;
}

function move_in(img_name,img_src) {
 document[img_name].src=img_src
}

function move_out(img_name,img_src) {
 document[img_name].src=img_src
}