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**
 * Marks the beginning of a collapse block's open phase.
 * This will be visible if the block is expanded, or if
 * javascript is disabled.
 * @param string Collapse block name
 * @param string Collapse block section
 */
function collapse_open( $p_name, $p_section = '' ) {
	global $g_current_collapse_section, $g_open_collapse_section;

	$t_block = ( is_blank( $p_section ) ? $p_name : $p_section . '_' . $p_name );
	$t_display = collapse_display( $t_block );

	# make sure no other collapse section is started
	if( $g_current_collapse_section !== null ) {
		trigger_error( ERROR_GENERIC, ERROR );
	}

	$g_open_collapse_section = true;
	$g_current_collapse_section = $t_block;

	$t_div_id = $t_block . '_open';
	echo '<div id="', $t_div_id, '"', ( $t_display ? '' : ' class="hidden"' ), '>';
}

/**
 * Marks the end of a collapse block's open phase and the beginning
 * of the block's closed phase.  Thi will only be visible if the
 * block have been collapsed and javascript is enabled.
 * @param string Collapse block name
 * @param string Collapse block section
 */
function collapse_closed( $p_name, $p_section = '' ) {
	global $g_current_collapse_section, $g_open_collapse_section;

	$t_block = ( is_blank( $p_section ) ? $p_name : $p_section . '_' . $p_name );
	$t_display = !collapse_display( $t_block );

	# Make sure a section is opened, and it is the same section.
	if( $t_block !== $g_current_collapse_section ) {
		trigger_error( ERROR_GENERIC, ERROR );
	}

	echo '</div>';

	$g_open_collapse_section = false;

	ob_start();

	$t_div_id = $t_block . '_closed';
	echo '<div id="', $t_div_id, '"', ( $t_display ? '' : ' class="hidden"' ), '>';
}

/**
 * Marks the location where a +/- icon is placed in output
 * for the user to toggle the collapse block status.
 * This should appear in both the open and closed phase of a block.
 * @param string Collapse block name
 * @param string Collapse block section
 */
function collapse_icon( $p_name, $p_section = '' ) {
	if( OFF == config_get( 'use_javascript' ) ) {
		return;
	}

	$t_block = ( is_blank( $p_section ) ? $p_name : $p_section . '_' . $p_name );

	global $g_open_collapse_section;

	if( $g_open_collapse_section === true ) {
		$t_icon = 'minus.png';
		$t_alt = '-';
	} else {
		$t_icon = 'plus.png';
		$t_alt = '+';
	}

	echo "<a href=\"\" onclick=\"ToggleDiv( '$t_block' ); return false;\"
			><img border=\"0\" src=\"images/$t_icon\" alt=\"$t_alt\" /></a>&#160;";
}

/**
 * Marks the end of a collaps block's closed phase.
 * Closed phase output is discarded if javascript is disabled.
 * @param string Collapse block name
 * @param string Collapse block section
 */
function collapse_end( $p_name, $p_section = '' ) {
	global $g_current_collapse_section, $g_open_collapse_section;

	$t_block = ( is_blank( $p_section ) ? $p_name : $p_section . '_' . $p_name );
	$t_display = collapse_display( $t_block );

	# Make sure a section is opened, and it is the same section.
	if( $t_block !== $g_current_collapse_section ) {
		ob_end_clean();
		trigger_error( ERROR_GENERIC, ERROR );
	}

	echo '</div>';

	$g_open_collapse_section = false;

	if( ON == config_get( 'use_javascript' ) ) {
		ob_end_flush();
	} else {
		ob_end_clean();
	}

	$g_current_collapse_section = null;
}

/**
 * Determine if a block should be displayed open by default.
 * @param string Collapse block
 * @return bool
 */
function collapse_display( $p_block ) {
	global $g_collapse_cache_token;

	if( !isset( $g_collapse_cache_token[$p_block] ) || OFF == config_get( 'use_javascript' ) ) {
		return true;
	}

	return( true == $g_collapse_cache_token[$p_block] );
}