function ufront_js()
 {
     $variables = array('url' => admin_url('admin-ajax.php'));
     $themeopt = new uwpqsfclass();
     $themeops = $themeopt->uwpqsf_theme();
     $themenames = $themeopt->uwpqsf_theme_val();
     if (isset($themenames)) {
         foreach ($themeops as $k) {
             if (in_array($k['themeid'], $themenames)) {
                 wp_register_style($k['themeid'], $k['link'], array(), 'all');
                 wp_enqueue_style($k['themeid']);
             }
             wp_enqueue_script('uwpqsfscript', plugins_url('/scripts/uwpqsfscript.js', __FILE__), array('jquery'), '1.0', true);
             wp_localize_script('uwpqsfscript', 'ajax', $variables);
         }
         // end foreach
     }
     //end if
 }
<?php

add_thickbox();
$html = '<div class="cbox"><h3>' . __("Form's Theme", "UWPQSF") . '</h3>';
$themes = get_post_meta($postid, 'uwpqsf-theme', true);
$extheme = '';
$themeopt = new uwpqsfclass();
$themeops = $themeopt->uwpqsf_theme();
if (!empty($themes)) {
    $extheme = explode('|', $themes);
}
$html .= '<div class="fullwide">';
$c = 1;
foreach ($themeops as $k) {
    $default = empty($extheme) && $k['themeid'] == 'udefault' ? 'checked="checked"' : '';
    $checked = !empty($extheme) && $k['themeid'] == $extheme[0] ? 'checked="checked"' : '';
    $value = $k['themeid'] . '|' . $k['link'] . '|' . $k['id'] . '|' . $k['class'];
    $html .= '<label class="ptheme">';
    $html .= '<input type="radio" name="themeopt" value="' . $value . '" ' . $checked . '  ' . $default . '">' . $k['name'] . '<br>';
    $html .= '<a href="#TB_inline?width=600&height=600&inlineId=themethumb_' . $c . '" class="thickbox">' . __(" Preview", "UWPQSF") . '</a>';
    $html .= '<div class="clear"></div></label>';
    $html .= '<div id="themethumb_' . $c . '"  style="display:none"><img src="' . $k['thumb'] . '"></div>';
    $c++;
}
$html .= '<div class="clear"></div></div></div><br><br>';
echo $html;