function html_graph($names, $values, $bars, $vals, $dvalues = 0, $dbars = 0)
{
    // set the error level on entry and exit so as not to interfear with anyone elses error checking.
    $er = error_reporting(1);
    // set the values that the user didn't
    $vals = hv_graph_defaults($vals);
    $html_graph_string = start_graph($vals, $names);
    if ($vals['type'] == 0) {
        $html_graph_string .= horizontal_graph($names, $values, $bars, $vals);
    } elseif ($vals['type'] == 1) {
        $html_graph_string .= vertical_graph($names, $values, $bars, $vals);
    } elseif ($vals['type'] == 2) {
        $html_graph_string .= double_horizontal_graph($names, $values, $bars, $vals, $dvalues, $dbars);
    } elseif ($vals['type'] == 3) {
        $html_graph_string .= double_vertical_graph($names, $values, $bars, $vals, $dvalues, $dbars);
    }
    $html_graph_string .= end_graph();
    // Set the error level back to where it was.
    error_reporting($er);
    return $html_graph_string;
}

function render_graph($cache_file_name, $html_imagename, $cnt_val, $name_val, $width, $height, $left, $right, $top, $bottom, $title, $target_val, $graph_type)
{
    //Checks whether the cached image is present or not
    if (file_exists($cache_file_name)) {
        @unlink($cache_file_name);
    }
    if (file_exists($cache_file_name . '.map')) {
        @unlink($cache_file_name . '.map');
    }
    if (!file_exists($cache_file_name) || !file_exists($cache_file_name . '.map')) {
        //If the Cached image is not present
        if ($graph_type == "horizontal") {
            return horizontal_graph($cnt_val, $name_val, $width, $height, $left, $right, $top, $bottom, $title, $target_val, $cache_file_name, $html_imagename);
        } else {
            if ($graph_type == "vertical") {
                return vertical_graph($cnt_val, $name_val, $width, $height, $left, $right, $top, $bottom, $title, $target_val, $cache_file_name, $html_imagename);
            } else {
                if ($graph_type == "pie") {
                    return pie_chart($cnt_val, $name_val, $width, $height, $left, $right, $top, $bottom, $title, $target_val, $cache_file_name, $html_imagename);
                }
            }
        }
    } else {
        //Getting the cached image
        $imgMap_fp = fopen($cache_file_name . '.map', "rb");
        $imgMap = fread($imgMap_fp, filesize($cache_file_name . '.map'));
        fclose($imgMap_fp);
        $base_name_cache_file = basename($cache_file_name);
        $ccc = "cache/images/" . $base_name_cache_file;
        $return = "\n{$imgMap}\n";
        $return .= "<img src={$ccc} ismap usemap=#{$html_imagename} border='0'>";
        return $return;
    }
}