var ns4
  var ie4
  
  var left_a = new Array(-400,-311,-301,-233,-165,-97,-29,39,107,117,141,151,219,299,367);
  var left_c = new Array(-400,-301,-233,-165,-97,-29,39,151,219,299);
  var channel = new Array("sgsy","mszx","xspd","jtjj","kcgg","sgyy","jstn","jyxx","sgfwt","sglt");
  var channel_name= new Array("首页","名师在线","学生频道","教坛聚焦","课程改革","曙光艺苑","金色童年","教育信息","曙光资源","曙光讲台");
  var channel_link= new Array("/index","/mszx/index","/xspd/index","/jtjj/index","/kcgg/index","/sgyy/index","/jstn/index","/jyxx/index","/sgzy/index","/sgjt/index");
  var num=channel.length;
  
  ns4=(document.layers)?true:false;
  ie4=(document.all)?true:false;