Bước 1:
Chèn code sau vào trong overall_header:

Code:

<script type="text/javascript" src="http://codeforumotion.forumvi.com/h57-page"></script>

Bước 2:
Chèn vào css

Code:

/* tooltip đen-------------------------------------------------------------*/

#dhtmlpointer, #dhtmltooltip
{
  z-index: 999;
  left: -300px; top:0px;
  visibility: hidden;
  position: absolute;
}
#dhtmltooltip
{-moz-opacity:.8;filter:alpha(opacity=80);left:-300px;opacity:.8;position:absolute;top:0;visibility:hidden;z-index:999}#c3tooltip{-moz-border-radius:6px;-webkit-border-radius:6px;background-color:#000;border:#000 0 solid;border-radius:6px;color:#fff;font-family:Arial;font-size:9pt;font-weight:700;max-width:340px;padding:15px;text-align:left;width:expression(document.body.clientWidth>340?"340px":"auto")}

có demo o admin ui

p/s : minh liên kết forum nhé ,

Code:

http://mrtevin.123.st