function dianji()
        {
            var a=document.getElementById("dianji");
            var b=document.getElementById("xiaoxi");
//            var c=document.getElementById("b1");
//            var d=document.getElementById("b2");
            var e=document.getElementById("body1");
            var f=document.getElementById("body2");
            a.style.backgroundImage ="url(Images/b5.gif)";
            a.style.color="#0000FF";
            b.style.backgroundImage ="none";
            b.style.color="White";
//            c.style.display="block";
//            d.style.display="none";
            e.style.display="block";
            f.style.display="none";
            
        }
function xiaoxi()
        {
            var b=document.getElementById("dianji");
            var a=document.getElementById("xiaoxi");
//            var d=document.getElementById("b1");
//            var c=document.getElementById("b2");
            var f=document.getElementById("body1");
            var e=document.getElementById("body2");
            a.style.backgroundImage ="url(Images/b5.gif)";
            a.style.color="#0000FF";
            b.style.backgroundImage ="none";
            b.style.color="White";
//            c.style.display="block";
//            d.style.display="none";
            e.style.display="block";
            
            f.style.display="none";
        }