function exchange(num){    		
   var imgNode = $("#Image"+num);    		
   
   if(num ==0){
   		imgNode.attr("src","/images/menu_cn_03.jpg");
   }else if(num == 1){
   		imgNode.attr("src","/images/menu_cn_04.jpg");
   }else if(num == 2){
   		imgNode.attr("src","/images/menu_cn_05.jpg");
   }else if(num == 3){
   		imgNode.attr("src","/images/menu_cn_07.jpg");
   }else if(num == 4){
   		imgNode.attr("src","/images/menu_cn_07-05.jpg");
   }else if(num == 5){
   		imgNode.attr("src","/images/menu_cn_08.jpg");
   }else if(num == 6){
   		imgNode.attr("src","/images/menu_cn_09.jpg");
   }else if(num == 7){
   		imgNode.attr("src","/images/menu_cn_10.jpg");
   }else if(num == 8){
   		imgNode.attr("src","/images/menu_cn_11.jpg");
   }else if(num == 9){
   		imgNode.attr("src","/images/menu_cn_12.jpg");
   }
   else{
   		num = 0;
  		imgNode.attr("src","/images/menu_cn_03.jpg");
   }
   setCookie("num",num);
}

function setCookie(name,value)   
  {   
       var Days = 5; //此cookie将被保存 5天   
       var exp = new Date();         //new Date("December   31,   9998");   
       exp.setTime(exp.getTime()  + Days*24*60*60*1000);   
       document.cookie =name + "="+ escape(value)+";expires="+exp.toGMTString();   
  }   
  function getCookie(name)   
  {   
      var arr,reg=new RegExp("(^|   )"+name+"=([^;]*)(;|$)");   
      if(arr=document.cookie.match(reg)) return unescape(arr[2]);   
      else   return   null;   
  }