Block.tpl.php file variables for drupal 5x and 4x versions of drupal theme

Lays out content for blocks (left and/or right side of page). This template is optional, and can be overridden by copying the default template and modifying it. Available variables The $block object includes:
<?php
$block
->module
    The name of the module that generated the block
.
$block->delta
    The number of the block
for a particular module.
$block->subject
    The block title
.
?>
<?php
$block
->content
    The html content
for the block.
$block->status
    Status of block
(0 or 1).
$block->region
    Region name
, by default the available regions are 'left', 'right', 'header' and 'footer'.
$block->throttle:
   
Throttle setting.
?>
Other variables includes:
<?php
$directory
    The directory the theme is located in
, e.g. themes/garland or themes/garland/minelli.
$is_front
    True
if the front page is currently being displayed.
$id
    The sequential id of the block displayed
, ie: The first block is 1, the second block is 2 etc.
$block_id
    The same
as $id, but is reset for the left and right sidebars.
$zebra
    Alternates between
'odd' and 'even'. This is useful for creating 'zebra stripes' with your css.
$block_zebra
    The same
as $zebra, but is reset for the left and right sidebars.
?>