tagName的使用，留一笔_JavaScript

<script><BR><!--<BR>function TagSample(s)<BR>{<BR> var source=event.srcElement;<BR> if (source.tagName.toUpperCase() == "IMG")<BR> {<BR> if (s == 1)<BR> {<BR> source.style.border="1px solid #0000FF";<BR> }<BR> else<BR> {<BR> source.style.border="";<BR> }<BR> }<BR>}<BR>//--><BR></script>