jsの中でreplaceの使い方正則は全部条件に合う文字列を交替します.

<script language="javascript">
var strM = "\&quot; javascript. \&quot; is a good script. language \&quot;";

//    \&quot;        A k686     http://www.k686.com  http://www.9qc.com

alert(strM.replace(/\&quot;/g,"A"));
</script>