search form with post type filter

        <form role="search" method="get" id="searchform" class="searchform" action="<?php echo $siteurl; ?>">
            <div>
                <label class="screen-reader-text" for="s">Search</label>
                <input type="text" id="s" name="s" class="text" onfocus="if(this.value == 'Start typing and hit enter') { this.value = ''; }" value="<?php echo $squery; ?>" />
                <input type="submit" class="submitbutton button" value="Search" />
                <input type="radio" name="post_type" value="event"> Events
                <input type="radio" name="post_type" value="post"> Videos
            </div>
        </form>