var sliderHeight = "100px";

    $(document).ready(function() {
    $('.slider').each(function() {
    $('.slider').show();
            var current = $(this);
            current.attr("box_h", current.height());
        }
		 );

        $(".slider").css("height", sliderHeight);

        $(".slider_menu").html('<a href="#">Read More</a>');
        $(".slider_menu a").click(function() { openSlider() })
    });

    function openSlider() {
        var open_height = $(".slider").attr("box_h") + "px";
        $(".slider").animate({ "height": open_height }, { duration: "slow" });

        $(".slider_menu").html('<a href="#">Close</a>');
        $(".slider_menu a").click(function() { closeSlider() })
    }

    function closeSlider() {
        $(".slider").animate({ "height": sliderHeight }, { duration: "slow" });

        $(".slider_menu").html('<a href="#">Read More</a>');
        $(".slider_menu a").click(function() { openSlider() })
    }