(function($) {
$.fn.expandcollapse = function() {
    return this.each(function() {
        obj = $(this);
        switch (obj.css("display")) {
            case "block":
                displayValue = "none";
                break;

            case "none":                    
            default:
                displayValue = "block";
        }

        obj.css("display", displayValue);
    });
};