function showMenu1(){
        document.getElementById("master2").style.backgroundImage = "url('Images/Master/Menu_bg.gif')";
      
        }
        function Menu1(){
        document.getElementById("master2").style.backgroundImage = "url('Images/Master/主页tou_06.gif')";
        
        }
        function showMenu2(){
        document.getElementById("master3").style.backgroundImage = "url('Images/Master/Menu_bg.gif')";
       
        }
         function Menu2(){
        document.getElementById("master3").style.backgroundImage = "url('Images/Master/主页tou_08.gif')";
        
        }
         function showMenu3(){
        document.getElementById("master4").style.backgroundImage = "url( 'Images/Master/Menu_bg.gif')";
       
        }
         function Menu3(){
        document.getElementById("master4").style.backgroundImage = "url('Images/Master/主页tou_10.gif')";
        
        }
         function showMenu4(){
        document.getElementById("master5").style.backgroundImage = "url( 'Images/Master/Menu_bg.gif')";
       
        }
         function Menu4(){
        document.getElementById("master5").style.backgroundImage = "url('Images/Master/主页tou_12.gif')";
        
        }
         function showMenu5(){
        document.getElementById("master6").style.backgroundImage = "url( 'Images/Master/Menu_bg.gif')";
       
        }
         function Menu5(){
        document.getElementById("master6").style.backgroundImage = "url('Images/Master/主页tou_14.gif')";
        
        }
         function showMenu6(){
        document.getElementById("master7").style.backgroundImage = "url( 'Images/Master/Menu_bg.gif')";
       
        }
         function Menu6(){
        document.getElementById("master7").style.backgroundImage = "url('Images/Master/主页tou_16.gif')";
        
        }
         function showMenu7(){
        document.getElementById("master8").style.backgroundImage = "url( 'Images/Master/Menu_bg.gif')";
       
        }
         function Menu7(){
        document.getElementById("master8").style.backgroundImage = "url('Images/Master/主页tou_18.gif')";
        
        }