jquery如何设置控件位置

http://www.1000year.com/blog/834/

http://blog.csdn.net/wyqlxy/article/details/6728934

         var offsettop=$("#form1 table").offset().top;   
         var offsetleft=$("#form1 table").offset().left;  
         $("#prompt").css({position: "absolute",'top':offsettop,'left':offsetleft,'z-index':2});