LinkRow: Quick button row generation

CLASS_LINKROW.PHP
=================

A simple implementation of drop-down buttons.

header1 | header2 | header3 | ....
   |         |
   V         V
 item11    item21
 item12

Mouse hover over header1 will drop down list of item11 and item12.
Each button, includer header and item, can be either a http link or just a comment.
The presentation of the button are based on CSS style and can be specified individualy.

To construct above lists:

   $linkrow = new LINKROW();      // no parameter needed
   // Add first column
   $linkrow->AddColumn();         // start of first column
   $linkrow->AddItem("header1", "", "header-no-link");  // header button (always display)
   $linkrow->AddItem("item11", "http://item11", "linkstyle");  // first button with link
   $linkrow->AddItem("item12", "", "commentstyle");  // second button is just a comment
   // Add second column
   $linkrow->AddColumn();         // start of first column
   $linkrow->AddItem("header2", "http://header2", "header-with-link");  // header button (always display)
   $linkrow->AddItem("item21", "http://item21", "linkstyle");  // first button with link
   // Add third column
   $linkrow->AddColumn();         // start of first column
   $linkrow->AddItem("header3", "http://header3", "header-with-link");  // header button (always display)
   // Add fourth column
   $linkrow->AddColumn();         // start of first column
    ....

You need to create the corresponding style in the html page:

<style>
.header-no-link     {....}
.header-with-link   {....}
.linkstyle          {....}
.commentstyle       {....}
:hover { background:white; ...}    // nice to have
</style>

Embeded in the place you want to display the list:

    <?php $linkrow->GenDropTable(); ?>

Tested on IE 6 and Netscape 7.


FUNCTION
========

    LINKROW()   : instantiate the class
    AddColumn() : Add a column marker
    AddItem( "Description", "Link", "Style")
            Description: Text appears on the screen
            Link: If something is keyed in, it will be put into:
                  <A HREF="Link">DESCRIPTION</A>. If not, only Description will be printed
            STYLE: the format will use class="Style" in the <DIV> tag.
    GenDropTable() : return a string