Probleme mit IE8

BACKGROUND SLIDESHOW
/*-----------------------------------------------------------------------------------*/


if ( !function_exists('bgSlideshow') ) {
    function bgSlideshow() {
 
        query_posts(array('post_type' => 'slider', 'posts_per_page' => -1));
        if ( get_option('vernissage_theme_fullscreen_stream') == 'supersized.flickr.js'  || have_posts() & get_option('vernissage_theme_fullscreen_stream') == 'supersized.js') : ?>
        <script type = "text/javascript">
        jQuery(function () {
            jQuery.supersized({
                //Functionality


                progress_bar : 1, // Timer for each slide
                slideshow : 1, // Slideshow on/off
                autoplay : 1, // Slideshow starts playing automatically
                mouse_scrub : 0,
                slide_links : 'blank', // Individual links for each slide (Options: false, 'number', 'name', 'blank')
                start_slide :  <?php echo get_option("vernissage_theme_fullscreen_start_slide") ?> , //Start slide (0 is random)
                slide_interval :  <?php echo get_option("vernissage_theme_fullscreen_delay") ?> ,
                transition :  <?php echo get_option("vernissage_theme_fullscreen_effect") ?> ,
                transition_speed :  <?php echo get_option("vernissage_theme_fullscreen_transition") ?> ,
                keyboard_nav :  <?php echo get_option("vernissage_theme_fullscreen_nav_keyb") ?> ,
                performance :  <?php echo get_option("vernissage_theme_fullscreen_performance") ?> ,
                slide_counter : 0,
                slide_captions : 0,
                <?php if (get_option('vernissage_theme_fullscreen_stream') == 'supersized.flickr.js') { ?>
                source : 2,
                user : '<?php echo get_option("vernissage_theme_sflickr_userid")?>',
                total_slides :  <?php echo get_option("vernissage_theme_sflickr_icount") ?> ,
                image_size : '<?php echo get_option("vernissage_theme_sflickr_isize")?>',
                api_key : '<?php echo trim(get_option("vernissage_theme_sflickr_api"))?>',
                <?php } else { ?>
                image_path : '../i/',          
                    slides : [
                    <?php    $tti = 0; while (have_posts()): the_post(); ?>
                        <?php if ($tti)
                            echo ',';
                        $tti++;
                        $full = wp_get_attachment_image_src(get_post_thumbnail_id(), 'full');
                        $title = get_post_meta(get_the_ID(), '_slide_title_value', true);
                        echo "{image:'";
                        echo $full[0];
                        if ( $title != '') {
                        echo "',title:'";
                        echo $title;}
                        echo "',thumb:'";
                        echo "'}" ?>                     
                         <?php endwhile ?>
                         <?php wp_reset_query(); ?>
                         ]
                <?php } ?>
            });
        });
        </script >    
        <?php elseif ( have_posts() & get_option('vernissage_theme_fullscreen_stream') == 'ken_b'): ?>
        
        <script type = "text/javascript">
        jQuery(function () {
        
            jQuery('body').append('<canvas id="kenburns"><p>Your browser doesn"t support canvas!</p></canvas>');        
            jQuery('#kenburns').attr('width', jQuery(window).width() + 'px');
            jQuery('#kenburns').attr('height', jQuery(window).height() + 'px'); 
            kenres();
            jQuery(window).resize(function () {
            
                jQuery('#kenburns').remove();
                jQuery('body').append('<canvas id="kenburns"><p>Your browser doesn"t support canvas!</p></canvas>');    
                
                jQuery('#kenburns').attr('width', jQuery(window).width());
                jQuery('#kenburns').attr('height', jQuery(window).height());
                kenres();
                        
            });
            
            function kenres() {
            jQuery('#kenburns').kenburns({
                //Functionality
          
                    images: [
                    <?php    $tti = 0; while (have_posts()): the_post(); ?>
                        <?php if ($tti)
                            echo ',';
                        $tti++;
                        $full = wp_get_attachment_image_src(get_post_thumbnail_id(), 'full');
                        $title = get_post_meta(get_the_ID(), '_slide_title_value', true);
                        echo "'";
                        echo $full[0];
                        echo "'" ?>                     
                         <?php endwhile ?>
                         <?php wp_reset_query(); ?>
                         ],
                    frames_per_second: <?php echo get_option("vernissage_theme_ken_b_frames") ?>,
                    display_time: <?php echo get_option("vernissage_theme_ken_b_delay") ?>,
                    fade_time: <?php echo get_option("vernissage_theme_ken_b_transition") ?>,
                    zoom: <?php echo get_option("vernissage_theme_ken_b_zoom") ?>,
                    background_color:'#ffffff',
                    post_render_callback:function($canvas, context) {
                        // Called after the effect is rendered
                        // Draw anything you like on to of the canvas
                        
                        context.save();
                        context.fillStyle = '#000';
                        context.font = 'bold 20px sans-serif';
                    
                        var width = jQuery(window).width();
                        var height =  jQuery(window).height();
                    
                        var text = "";
                        var metric = context.measureText(text);
                        
                        context.fillStyle = '#fff';
                        
                        context.shadowOffsetX = 3;
                        context.shadowOffsetY = 3;
                        context.shadowBlur = 4;
                        context.shadowColor = 'rgba(0, 0, 0, 0.8)';
                        
                        //context.fillText(text, width - metric.width - 8, height - 8);                        
                        
                        context.restore();                        
                    }
            });
            }
        });
        </script >    
        
        <?php 
        
        endif;
        hideloader();
    }
}