TOP /JavaScript 画像上の座標を所得する(NN6にも対応)

<form name="myform">
<input name="zahyou"type="text"readonly><br>
</form>
<img src="01.jpg"name="image1"
onmouseout="document.myform.zahyou.value=''">
<script language="JavaScript"><!--
function mouse_position(NNevent){
if(document.all){
document.myform.zahyou.value=event.offsetY+':'+event.offsetX;
}else{
yy=NNevent.pageY-document.image1.offsetTop;
xx=NNevent.pageX-document.image1.offsetLeft;
document.myform.zahyou.value=yy+':'+xx;
}
}
document.image1.onmousemove =mouse_position;
/*himajin.moo.jp*/
// --></script>