do while..

Jeg har en masse rollover billeder, der kan laves meget kortere med noget do while ting...

Men jeg er ikke ret sej til javascript.. kan du lave det?

<script language=\"JavaScript\">
<!--
img1on = new Image();
img1on.src = \"pix/sub1on.gif\";
img1off = new Image();
img1off.src = \"pix/sub1off.gif\";

img2on = new Image();
img2on.src = \"pix/sub2on.gif\";
img2off = new Image();
img2off.src = \"pix/sub2off.gif\";

img3on = new Image();
img3on.src = \"pix/sub3on.gif\";
img3off = new Image();
img3off.src = \"pix/sub3off.gif\";

img4on = new Image();
img4on.src = \"pix/sub4on.gif\";
img4off = new Image();
img4off.src = \"pix/sub4off.gif\";

img5on = new Image();
img5on.src = \"pix/sub5on.gif\";
img5off = new Image();
img5off.src = \"pix/sub5off.gif\";

img6on = new Image();
img6on.src = \"pix/sub6on.gif\";
img6off = new Image();
img6off.src = \"pix/sub6off.gif\";

img7on = new Image();
img7on.src = \"pix/sub7on.gif\";
img7off = new Image();
img7off.src = \"pix/sub7off.gif\";

img8on = new Image();
img8on.src = \"pix/sub8on.gif\";
img8off = new Image();
img8off.src = \"pix/sub8off.gif\";

img9on = new Image();
img9on.src = \"pix/sub9on.gif\";
img9off = new Image();
img9off.src = \"pix/sub9off.gif\";

img10on = new Image();
img10on.src = \"pix/sub10on.gif\";
img10off = new Image();
img10off.src = \"pix/sub10off.gif\";

img11on = new Image();
img11on.src = \"pix/sub11on.gif\";
img11off = new Image();
img11off.src = \"pix/sub11off.gif\";

img12on = new Image();
img12on.src = \"pix/sub12on.gif\";
img12off = new Image();
img12off.src = \"pix/sub12off.gif\";

img13on = new Image();
img13on.src = \"pix/sub13on.gif\";
img13off = new Image();
img13off.src = \"pix/sub13off.gif\";

img14on = new Image();
img14on.src = \"pix/sub14on.gif\";
img14off = new Image();
img14off.src = \"pix/sub14off.gif\";

img15on = new Image();
img15on.src = \"pix/sub15on.gif\";
img15off = new Image();
img15off.src = \"pix/sub15off.gif\";

img16on = new Image();
img16on.src = \"pix/sub16on.gif\";
img16off = new Image();
img16off.src = \"pix/sub16off.gif\";

img17on = new Image();
img17on.src = \"pix/sub17on.gif\";
img17off = new Image();
img17off.src = \"pix/sub17off.gif\";

img18on = new Image();
img18on.src = \"pix/sub18on.gif\";
img18off = new Image();
img18off.src = \"pix/sub18off.gif\";

img19on = new Image();
img19on.src = \"pix/sub19on.gif\";
img19off = new Image();
img19off.src = \"pix/sub19off.gif\";

img20on = new Image();
img20on.src = \"pix/sub20on.gif\";
img20off = new Image();
img20off.src = \"pix/sub20off.gif\";

function showMenu() {

document[\"img1\"].src = img1on.src;
}

function showMenu2() {
document[\"img2\"].src = img2on.src;
}

function showMenu3() {
document[\"img3\"].src = img3on.src;
}

function showMenu4() {
document[\"img4\"].src = img4on.src;
}

function showMenu5() {
document[\"img5\"].src = img5on.src;
}

function showMenu6() {
document[\"img6\"].src = img6on.src;
}

function showMenu7() {
document[\"img7\"].src = img7on.src;
}

function showMenu8() {
document[\"img8\"].src = img8on.src;
}

function showMenu9() {
document[\"img9\"].src = img9on.src;
}

function showMenu10() {
document[\"img10\"].src = img10on.src;
}

function showMenu11() {
document[\"img11\"].src = img11on.src;
}

function showMenu12() {
document[\"img12\"].src = img12on.src;
}

function showMenu13() {
document[\"img13\"].src = img13on.src;
}

function showMenu14() {
document[\"img14\"].src = img14on.src;
}

function showMenu15() {
document[\"img15\"].src = img15on.src;
}

function showMenu16() {
document[\"img16\"].src = img16on.src;
}

function showMenu17() {
document[\"img17\"].src = img17on.src;
}

function showMenu18() {
document[\"img18\"].src = img18on.src;
}

function showMenu19() {
document[\"img19\"].src = img19on.src;
}

function showMenu20() {
document[\"img20\"].src = img20on.src;
}

//show off stage

function origState() {
document[\"img1\"].src = img1off.src;
}

function origState2() {
document[\"img2\"].src = img2off.src;
}

function origState3() {
document[\"img3\"].src = img3off.src;
}

function origState4() {
document[\"img4\"].src = img4off.src;
}

function origState5() {
document[\"img5\"].src = img5off.src;
}

function origState6() {
document[\"img6\"].src = img6off.src;
}

function origState7() {
document[\"img7\"].src = img7off.src;
}

function origState8() {
document[\"img8\"].src = img8off.src;
}

function origState9() {
document[\"img9\"].src = img9off.src;
}

function origState10() {
document[\"img10\"].src = img10off.src;
}

function origState11() {
document[\"img11\"].src = img11off.src;
}

function origState12() {
document[\"img12\"].src = img12off.src;
}

function origState13() {
document[\"img13\"].src = img13off.src;
}

function origState14() {
document[\"img14\"].src = img14off.src;
}

function origState15() {
document[\"img15\"].src = img15off.src;
}

function origState16() {
document[\"img16\"].src = img16off.src;
}

function origState17() {
document[\"img17\"].src = img17off.src;
}

function origState18() {
document[\"img18\"].src = img18off.src;
}

function origState19() {
document[\"img19\"].src = img19off.src;
}

function origState20() {
document[\"img20\"].src = img20off.src;
}

// -->

</script>