js提示框请教

Question

   我想实现如下图的效果：鼠标单击表格td元素，然后td元素上显示如下图"."表示实线，里面有文字。请问这个提示框叫什么名字（如果可以的话给个源代码看看）谢谢了……
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                                  .   你好                     .
                                  .                            .
                                  .                            .
                                  .                            .
                                  .....     ....................
                                      .    .
                                      .   .
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                                      . .
                                      .
                     

Answer 1

这个可以吗
http://kb.cnblogs.com/a/1501424/

Answer 2

..........
. hello  .
.        .
.    .....
.   .
.  .
. .
.是这样的不好意思，找不到实例，只能打出来……

Answer 3

**************
*hello-------*
*----*********
*---*
*--*
**
*
"*"是边框，"-"是空白处可以显示字符