How to find the active editarea in jquery

I am using editarea editor in content management system. In my page there are 3 editarea, so how can i find the editarea id when it is activ开发者_Go百科e, ie need to find in which editarea the cursor is pointing.

You can find with jquery

var id;

$("textarea").focus(function () {
     id = this.id;
});

or

var id = $("*:focus").attr("id");