単純な画像反転を実装する JavaScript メソッド_JavaScript スキル

<script type="text/javascript">
var revert = new Array();
var inames = new Array('smirk');
// Preload
if (document.images) {
 var flipped = new Array();
 for(i=0; i< inames.length; i++) {
  flipped[i] = new Image();
  flipped[i].src = ""+inames[i]+"2.JPG";
 }
}
function over(num) {
 if(document.images) {
  revert[num] = document.images[inames[num]].src;
  document.images[inames[num]].src = flipped[num].src;
 }
}
function out(num) {
 if(docu <script type="text/javascript">
var revert = new Array();
var inames = new Array('smirk');
// Preload
if (document.images) {
 var flipped = new Array();
 for(i=0; i< inames.length; i++) {
  flipped[i] = new Image();
  flipped[i].src = ""+inames[i]+"2.JPG";
 }
}
function over(num) {
 if(document.images) {
  revert[num] = document.images[inames[num]].src;
  document.images[inames[num]].src = flipped[num].src;
 }
}
function out(num) {
 if(document.images) document.images[inames[num]].src = revert[num];
}
</script>