// JavaScript Document
     function go_to(div_id,num){
		for(var i=1;i<=6;i++)
			{
				var aa=document.getElementById("down_xianlu_"+i);
				aa.style.display=i==num?"block":"none";
			}		
							  
	}
	
	function go_to2(num2){
	   for (var j=1;j<=6;j++)
	     {
		  var bb=document.getElementById("down_xianlu2_"+j);
			 bb.style.display=j==num2?"block":"none";
		  
		 }
	
	}
	
	function go_to3(num3){
	   for (var k=1;k<=6;k++)
	     {
		        var cc=document.getElementById("down_xianlu3_"+k);
				cc.style.display=k==num3?"block":"none";
		 }
	
	}
	
	function go_to4(num4){
	   for (var w=1;w<=6;w++)
	     {
		        var dd=document.getElementById("down_xianlu4_"+w);
				dd.style.display=w==num4?"block":"none";
		 }
	
	}