net jquery添加行(克隆行)和文本框，动态下拉

When the user click's the add box attribute the row(i.e the row with 2 dropdown and textbox needs to be added) row with above needs to be dynamically created using jquery(so that there is no post back). User will be allowed to add as many attirbutes as he wants and when they click the check box that row needs to be deleted. How this can be achieved by jquery.When the user click's the add box attribute the