echo '<script>

$(document).ready(function(){

    var maxLength = 500;

    $(".show-read-more").each(function(){

        var myStr = $(this).html();

        if($.trim(myStr).length > maxLength){

            var newStr = myStr.substring(0, maxLength);

            var removedStr = myStr.substring(maxLength, $.trim(myStr).length);

            $(this).empty().html(newStr);

            $(this).append(\'<a href="javascript:void(0);" class="read-more"><br><div align="center"><b>...continue reading...</b></div></a>\');

            $(this).append(\'<span class="more-html">\'+removedStr+\'</span>\');

        }

    });

    $(".read-more").click(function(){

        $(this).siblings(".more-html").contents().unwrap();

        $(this).remove();

    });

});

</script>\n';

.show-read-more .more-html {

        display: none;

}

<p class='show-read-more'>$body</p>