//折叠样式
  function toggle(sDivId) {
                var oDiv = document.getElementById(sDivId);
                oDiv.style.display = (oDiv.style.display == "none") ? "block" : "none";
            }
				

//
				
//var current_nav=null;
	var new_nav=null;
				
	function show_nav(id)
				{
					
				//	var current_nav =document.getElementById("current");
					var new_nav = document.getElementById("first_nav_" + id);
					//if (new_nav.id == "")
					//{
					//	current_nav.id="";
						
						new_nav.id = "current";
					//	current_nav = new_nav;
			//	}
					
						
				//	if (current_nav) current_nav.id="";
						 
					
					
				//	if (new_nav) new_nav.id= "current";
				//	current_nav = new_nav;
				}
				
				
	/*	
		var current_nav ;
		function show_nav(id)
{

 if ("id")
 {


	var nav_parent = document.getElementById("first_nav_" + id);
	nav_parent.className = "choose";
	if (current_nav){
		if (current_nav!=nav_parent) current_nav.className = ""
	}else{
		current_nav = document.getElementById("first_nav_0");
		//current_child = document.getElementById("second_nav_1");
		if (current_nav != nav_parent) current_nav.className = ""
	}
	current_nav = nav_parent;
	 }
	 else{

  if (current_nav){
    current_nav.className = "choose";
  }
	}
	
}
*/
	
//xmlhttp对象操作