EDIT

<?php

/**

 * @file

 * Contains the theme's functions to manipulate Drupal's default markup.

 *

 * A QUICK OVERVIEW OF DRUPAL THEMING

 *

 *   The default HTML for all of Drupal's markup is specified by its modules.

 *   For example, the comment.module provides the default HTML markup and CSS

 *   styling that is wrapped around each comment. Fortunately, each piece of

 *   markup can optionally be overridden by the theme.

 *

 *   Drupal deals with each chunk of content using a "theme hook". The raw

 *   content is placed in PHP variables and passed through the theme hook, which

 *   can either be a template file (which you should already be familiary with)

 *   or a theme function. For example, the "comment" theme hook is implemented

 *   with a comment.tpl.php template file, but the "breadcrumb" theme hooks is

 *   implemented with a theme_breadcrumb() theme function. Regardless if the

 *   theme hook uses a template file or theme function, the template or function

 *   does the same kind of work; it takes the PHP variables passed to it and

 *   wraps the raw content with the desired HTML markup.

 *

 *   Most theme hooks are implemented with template files. Theme hooks that use

 *   theme functions do so for performance reasons - theme_field() is faster

 *   than a field.tpl.php - or for legacy reasons - theme_breadcrumb() has "been

 *   that way forever."

 *

 *   The variables used by theme functions or template files come from a handful

 *   of sources:

 *   - the contents of other theme hooks that have already been rendered into

 *     HTML. For example, the HTML from theme_breadcrumb() is put into the

 *     $breadcrumb variable of the page.tpl.php template file.

 *   - raw data provided directly by a module (often pulled from a database)

 *   - a "render element" provided directly by a module. A render element is a

 *     nested PHP array which contains both content and meta data with hints on

 *     how the content should be rendered. If a variable in a template file is a

 *     render element, it needs to be rendered with the render() function and

 *     then printed using:

 *       <?php print render($variable); ?>

 *

 * ABOUT THE TEMPLATE.PHP FILE

 *

 *   The template.php file is one of the most useful files when creating or

 *   modifying Drupal themes. With this file you can do three things:

 *   - Modify any theme hooks variables or add your own variables, using

 *     preprocess or process functions.

 *   - Override any theme function. That is, replace a module's default theme

 *     function with one you write.

 *   - Call hook_*_alter() functions which allow you to alter various parts of

 *     Drupal's internals, including the render elements in forms. The most

 *     useful of which include hook_form_alter(), hook_form_FORM_ID_alter(),

 *     and hook_page_alter(). See api.drupal.org for more information about

 *     _alter functions.

 *

 * OVERRIDING THEME FUNCTIONS

 *

 *   If a theme hook uses a theme function, Drupal will use the default theme

 *   function unless your theme overrides it. To override a theme function, you

 *   have to first find the theme function that generates the output. (The

 *   api.drupal.org website is a good place to find which file contains which

 *   function.) Then you can copy the original function in its entirety and

 *   paste it in this template.php file, changing the prefix from theme_ to

 *   STARTERKIT_. For example:

 *

 *     original, found in modules/field/field.module: theme_field()

 *     theme override, found in template.php: STARTERKIT_field()

 *

 *   where STARTERKIT is the name of your sub-theme. For example, the

 *   zen_classic theme would define a zen_classic_field() function.

 *

 *   Note that base themes can also override theme functions. And those

 *   overrides will be used by sub-themes unless the sub-theme chooses to

 *   override again.

 *

 *   Zen core only overrides one theme function. If you wish to override it, you

 *   should first look at how Zen core implements this function:

 *     theme_breadcrumbs()      in zen/template.php

 *

 *   For more information, please visit the Theme Developer's Guide on

 *   Drupal.org: http://drupal.org/node/173880

 *

 * CREATE OR MODIFY VARIABLES FOR YOUR THEME

 *

 *   Each tpl.php template file has several variables which hold various pieces

 *   of content. You can modify those variables (or add new ones) before they

 *   are used in the template files by using preprocess functions.

 *

 *   This makes THEME_preprocess_HOOK() functions the most powerful functions

 *   available to themers.

 *

 *   It works by having one preprocess function for each template file or its

 *   derivatives (called theme hook suggestions). For example:

 *     THEME_preprocess_page    alters the variables for page.tpl.php

 *     THEME_preprocess_node    alters the variables for node.tpl.php or

 *                              for node--forum.tpl.php

 *     THEME_preprocess_comment alters the variables for comment.tpl.php

 *     THEME_preprocess_block   alters the variables for block.tpl.php

 *

 *   For more information on preprocess functions and theme hook suggestions,

 *   please visit the Theme Developer's Guide on Drupal.org:

 *   http://drupal.org/node/223440 and http://drupal.org/node/1089656

 */

/**

 * @param $which_image

 *   name of the image, see _zen_dataportal_imagenames() for possible values

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $default_image

 *  An file path relative to the theme folder

 * @param $css_selector

 *   The dom element to apply the image as background image

 * @param $background_style

 *   Addtional css setting for the background css attribute, default is  'scroll repeat'

 *

 * @see _zen_dataportal_imagenames() for possible values

 */

function _set_image_url($which_image, &$variables, $default_image = null, $css_selector = NULL, $background_style = 'scroll repeat') {

  if (!theme_get_setting('default_' . $which_image)) {

    $path = theme_get_setting($which_image . '_path');

    if(isset($path)){

      if (file_uri_scheme($path) == 'public') {

        $url = file_create_url($path);

      }

    }

  }

  if(!isset($url) && isset($default_image)) {

      $url = base_path() . path_to_theme() . '/' . $default_image;

  }

  if(isset($url)) {

    $variables[$which_image . '_url'] = $url;

    if($css_selector) {

      if(!isset($variables['inline_styles'])) {

        $variables['inline_styles'] = array();

      }

      $variables['inline_styles'][] = $css_selector . ' {background: white url(' . check_url($url) .')  ' . $background_style . ';}';

    }

  }

}

function _color_gradient($color_1, $color_2) {

  $css = '';

  $css .= sprintf('background: %1$s; /* for non-css3 browsers */', $color_1) . "\n";

  $css .= sprintf('filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=\'%1$s\', endColorstr=\'%2$s\'); /* for IE */', $color_1, $color_2) . "\n";

  $css .= sprintf('background: -webkit-gradient(linear, left top, left bottom, from(%1$s), to(%2$s)); /* for webkit browsers */', $color_1, $color_2) . "\n";

  $css .= sprintf('background: -moz-linear-gradient(top,  %1$s,  %2$s); /* for firefox 3.6+ */', $color_1, $color_2) . "\n";

  return $css;

}

/**

 *

 */

function _add_inline_styles(&$variables) {

  $css = array();

  if(!isset($variables['inline_styles'])) {

    $variables['inline_styles'] = array();

  }

  // site_name

  if(theme_get_setting('site-name_color')) {

      $variables['inline_styles'][] = '#site-name a span {color:' . check_plain(theme_get_setting('site-name_color')) . ';}';

  }

  if(theme_get_setting('main-menu_background-color')) {

    if(theme_get_setting('main-menu_background-color-2')) {

      // with gradient

      $variables['inline_styles'][] = '#main-menu {'

        . _color_gradient(

              theme_get_setting('main-menu_background-color'),

              theme_get_setting('main-menu_background-color-2'))

        . '}';

    } else {

      $variables['inline_styles'][] = '#main-menu {background-color:' . check_plain(theme_get_setting('main-menu_background-color')) . ';}';

    }

  }

  if(theme_get_setting('sub-header_background-color')) {

    $variables['inline_styles'][] = '#sub-header {background-color:' . check_plain(theme_get_setting('sub-header_background-color')) . ';}';

  }

  if(theme_get_setting('header_margin_bottom') && theme_get_setting('site_name_position') != 'below_banner') {

    $variables['inline_styles'][] = '#sub-header {min-height: 0; height:' . check_plain(theme_get_setting('header_margin_bottom')) . ';}';

  }

  if(theme_get_setting('logo_size')) {

    $logo_size = theme_get_setting('logo_size');

    $variables['inline_styles'][] = '#header {background-position:' . $logo_size['width'] . 'px 0;}';

    $variables['inline_styles'][] = '#main-menu, #sub-header {padding-left:' . $logo_size['width'] . 'px;}';

  }

}

/**

 * Override or insert variables into the maintenance page template.

 *

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $hook

 *   The name of the template being rendered ("maintenance_page" in this case.)

 */

/* -- Delete this line if you want to use this function

function STARTERKIT_preprocess_maintenance_page(&$variables, $hook) {

  // When a variable is manipulated or added in preprocess_html or

  // preprocess_page, that same work is probably needed for the maintenance page

  // as well, so we can just re-use those functions to do that work here.

  STARTERKIT_preprocess_html($variables, $hook);

  STARTERKIT_preprocess_page($variables, $hook);

}

// */

/**

 * Override or insert variables into the html templates.

 *

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $hook

 *   The name of the template being rendered ("html" in this case.)

 */

function zen_dataportal_preprocess_html(&$variables, $hook) {

  _set_image_url('body_background', $variables, NULL, 'body');

  _set_image_url('page_background', $variables, NULL, '#page');

  _set_image_url('banner', $variables, 'banner.jpg', '#header', 'scroll no-repeat content-box');

  _add_inline_styles($variables);

}

/**

 * Override or insert variables into the page templates.

 *

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $hook

 *   The name of the template being rendered ("page" in this case.)

 */

function zen_dataportal_preprocess_page(&$variables, $hook) {

  $variables['site_name_position'] = 'over_banner';

  if(theme_get_setting('site_name_position')) {

    $variables['site_name_position'] = check_plain(theme_get_setting('site_name_position'));

  }

  $variables['header_margin_bottom'] = 'over_banner';

  if(theme_get_setting('header_margin_bottom')) {

    $variables['header_margin_bottom'] = check_plain(theme_get_setting('header_margin_bottom'));

  }

}

/**

 * Override or insert variables into the node templates.

 *

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $hook

 *   The name of the template being rendered ("node" in this case.)

 */

/* -- Delete this line if you want to use this function

function STARTERKIT_preprocess_node(&$variables, $hook) {

  $variables['sample_variable'] = t('Lorem ipsum.');

  // Optionally, run node-type-specific preprocess functions, like

  // STARTERKIT_preprocess_node_page() or STARTERKIT_preprocess_node_story().

  $function = __FUNCTION__ . '_' . $variables['node']->type;

  if (function_exists($function)) {

    $function($variables, $hook);

  }

}

// */

/**

 * Override or insert variables into the comment templates.

 *

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $hook

 *   The name of the template being rendered ("comment" in this case.)

 */

/* -- Delete this line if you want to use this function

function STARTERKIT_preprocess_comment(&$variables, $hook) {

  $variables['sample_variable'] = t('Lorem ipsum.');

}

// */

/**

 * Override or insert variables into the region templates.

 *

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $hook

 *   The name of the template being rendered ("region" in this case.)

 */

/* -- Delete this line if you want to use this function

function STARTERKIT_preprocess_region(&$variables, $hook) {

  // Don't use Zen's region--sidebar.tpl.php template for sidebars.

  //if (strpos($variables['region'], 'sidebar_') === 0) {

  //  $variables['theme_hook_suggestions'] = array_diff($variables['theme_hook_suggestions'], array('region__sidebar'));

  //}

}

// */

/**

 * Override or insert variables into the block templates.

 *

 * @param $variables

 *   An array of variables to pass to the theme template.

 * @param $hook

 *   The name of the template being rendered ("block" in this case.)

 */

/* -- Delete this line if you want to use this function

function STARTERKIT_preprocess_block(&$variables, $hook) {

  // Add a count to all the blocks in the region.

  // $variables['classes_array'][] = 'count-' . $variables['block_id'];

  // By default, Zen will use the block--no-wrapper.tpl.php for the main

  // content. This optional bit of code undoes that:

  //if ($variables['block_html_id'] == 'block-system-main') {

  //  $variables['theme_hook_suggestions'] = array_diff($variables['theme_hook_suggestions'], array('block__no_wrapper'));

  //}

}

// */