function huan1()
	        {  	           
	            var bian1 = document.getElementById("bian1");              
	            var bian2 = document.getElementById("bian2");  
	            var bian3 = document.getElementById("bian3"); 
	            var bian4 = document.getElementById("bian4"); 
	            var bian5 = document.getElementById("bian5"); 
	            
	            bian1.background="images/b_25.jpg";
	            bian2.background=""; 
	            bian3.background="";  
	            bian4.background="";  
	            bian5.background="";    
	            
	            var divhuan1 = document.getElementById("huan1").style.display = "block";  
	            var divhuan2 = document.getElementById("huan2").style.display = "none";
	            var divhuan3 = document.getElementById("huan3").style.display = "none";
	            var divhuan4 = document.getElementById("huan4").style.display = "none";
	            var divhuan5 = document.getElementById("huan5").style.display = "none";
	            
	            
	                
	        }

	        function huan2()
	        {   
	            var bian1 = document.getElementById("bian1");              
	            var bian2 = document.getElementById("bian2");  
	            var bian3 = document.getElementById("bian3"); 
	            var bian4 = document.getElementById("bian4"); 
	            var bian5 = document.getElementById("bian5");
	               
	           bian1.background="";
	           bian2.background="images/b_25.jpg";
	           bian3.background="";  
	           bian4.background="";  
	           bian5.background="";  
	           
	            var divhuan1 = document.getElementById("huan1").style.display = "none";  
	            var divhuan2 = document.getElementById("huan2").style.display = "block";
	            var divhuan3 = document.getElementById("huan3").style.display = "none";
	            var divhuan4 = document.getElementById("huan4").style.display = "none";
	            var divhuan5 = document.getElementById("huan5").style.display = "none";  
	           
	          
	           
	            
	        }
	        
	        function huan3()
	        {  	           
	            var bian1 = document.getElementById("bian1");              
	            var bian2 = document.getElementById("bian2");  
	            var bian3 = document.getElementById("bian3"); 
	            var bian4 = document.getElementById("bian4"); 
	            var bian5 = document.getElementById("bian5"); 
	            
	            bian1.background="";
	            bian2.background=""; 
	            bian3.background="images/b_25.jpg";  
	            bian4.background="";  
	            bian5.background="";   
	            
	            var divhuan1 = document.getElementById("huan1").style.display = "none";  
	            var divhuan2 = document.getElementById("huan2").style.display = "none";
	            var divhuan3 = document.getElementById("huan3").style.display = "block";
	            var divhuan4 = document.getElementById("huan4").style.display = "none";
	            var divhuan5 = document.getElementById("huan5").style.display = "none";  
	                
	        }
	        
	        function huan4()
	        {  	           
	            var bian1 = document.getElementById("bian1");              
	            var bian2 = document.getElementById("bian2");  
	            var bian3 = document.getElementById("bian3"); 
	            var bian4 = document.getElementById("bian4"); 
	            var bian5 = document.getElementById("bian5"); 
	            
	            bian1.background="";
	            bian2.background=""; 
	            bian3.background="";  
	            bian4.background="images/b_25.jpg";  
	            bian5.background="";    
	            
	            var divhuan1 = document.getElementById("huan1").style.display = "none";  
	            var divhuan2 = document.getElementById("huan2").style.display = "none";
	            var divhuan3 = document.getElementById("huan3").style.display = "none";
	            var divhuan4 = document.getElementById("huan4").style.display = "block";
	            var divhuan5 = document.getElementById("huan5").style.display = "none";
	                
	        }
	        
	        function huan5()
	        {  	           
	            var bian1 = document.getElementById("bian1");              
	            var bian2 = document.getElementById("bian2");  
	            var bian3 = document.getElementById("bian3"); 
	            var bian4 = document.getElementById("bian4"); 
	            var bian5 = document.getElementById("bian5"); 
	            
	            bian1.background="";
	            bian2.background=""; 
	            bian3.background="";  
	            bian4.background="";  
	            bian5.background="images/b_25.jpg";    
	            
	            var divhuan1 = document.getElementById("huan1").style.display = "none";  
	            var divhuan2 = document.getElementById("huan2").style.display = "none";
	            var divhuan3 = document.getElementById("huan3").style.display = "none";
	            var divhuan4 = document.getElementById("huan4").style.display = "none";
	            var divhuan5 = document.getElementById("huan5").style.display = "block";
	                
	        }