socialforge/app/views/courses/_course_ad.html.erb

<div id="floatpoint" class="course_ad"  >
  <table  border=0>
    <tr>
      <td align=center bgcolor=#15bccf >
       <span class="ad_title"><%= l(:label_contact_us) %></span> 
      </td>
    </tr>
    <tr><td><p class="ad_content"><%= l(:label_course_ad_description) %></p></td></tr>
    <tr>
      <td align=center bgcolor="#ececec" >
      	<%= l(:label_course_adcolick) %><a href="http://user.trustie.net/users/12/user_newfeedback">黄井泉</a><br>
      </td>
    </tr>
    <tr>
      <td align=center bgcolor="#ececec" >
        Tel:15388083362<br>
      </td>
    <tr>
      <td align=center bgcolor="#ececec" >
       	<%= l(:label_course_adcolick) %><a href="http://user.trustie.net/users/6/user_newfeedback">王林春</a><br>
      </td>
    </tr>
    <tr>
      <td align=center bgcolor="#ececec" >
        Tel:13467631747<br>
      </td>
    </tr>
  </table>
</div>

<script type="text/javascript">
    var xstep=1;			// 移动步长，此参数越小，移动越平滑，最小值为1
    var delay_time=60;		// 每步的时间间隔，此参数越小，移动速度越快
    var YY=0;
    var screen_height = $(window).height();          //浏览器当前窗口文档的高度
    var screen_width = $(window).width();            //浏览器当前窗口文档的宽度

   window.setInterval(function(){move();},delay_time);
   function move()
   {
       var floatpoint_height = $("#floatpoint").height();
       YY += xstep;
       if(YY <= 0){xstep = 1; YY = 0;}					//如果浮动层超出了上界，则设定移动方向为向下；并设定层的位置为正好在上界处
       if(YY >= (screen_height-floatpoint_height))      //如果浮动层超出了下界，则设定移动方向为向上；并设定层的位置为正好在下界处
       {
           xstep = -1;
           YY=(screen_height-floatpoint_height);
       }
       $("#floatpoint").css("top",YY);
   }
   function change_size(){var body_width = $("#top-menu").width(); $("#floatpoint").css("left",screen_width/2+body_width/2+10);}
   $(document).ready(function(){change_size();});
   $(window).resize(function(){screen_width = $(window).width();change_size();});
</script>