function createHttpRequest() {

  //Win ie用
  if(window.ActiveXObject){
    try {
      //MSXML2以降用
      return new ActiveXObject("Msxml2.XMLHTTP") //[1]'
    } catch (e) {
      try {
        //旧MSXML用
        return new ActiveXObject("Microsoft.XMLHTTP") //[1]'
      } catch (e2) {
        return null
      }
    }
  } else if(window.XMLHttpRequest){
    //Win ie以外のXMLHttpRequestオブジェクト実装ブラウザ用
    return new XMLHttpRequest() //[1]'
  } else {
    return null
  }
}

function clickcount(clickid) {

  var httpoj = createHttpRequest();

  httpoj.open('GET','/do_count_click.rb?clickid='+clickid,false)
  httpoj.setRequestHeader("If-Modified-Since", "Thu, 01 Jun 1970 00:00:00 GMT");
  httpoj.send('clicked')

}