function bindReady(handler){
  
  var called = false
  
  function ready() { // (1)
  if (called) return
    called = true
    handler()
  }
  
  if ( document.addEventListener ) { // (2)
		document.addEventListener( "DOMContentLoaded", function(){
		  ready()
		}, false )
  } else if ( document.attachEvent ) {  // (3)

		// (3.1)
		if ( document.documentElement.doScroll && window == window.top ) {
		  function tryScroll(){
		    if (called) return
		      if (!document.body) return
			try {
			  document.documentElement.doScroll("left")
			  ready()
			} catch(e) {
			  setTimeout(tryScroll, 0)
			}
		  }
		  tryScroll()
		}
		
		// (3.2)
		document.attachEvent("onreadystatechange", function(){
		  
		  if ( document.readyState === "complete" ) {
		    ready()
		  }
		})
  }
  
  // (4)
  if (window.addEventListener)
    window.addEventListener('load', ready, false)
    else if (window.attachEvent)
      window.attachEvent('onload', ready)
      /*  else  // (4.1)
       *        window.onload=ready
       */
}


readyList = [];

function onReady(handler) {
  if (!readyList.length) {
    bindReady(function() {
      for(var i=0; i<readyList.length; i++) {
	readyList[i]()
      }
    })
  }
  readyList.push(handler)
}

function getXmlHttp(){
  var xmlhttp;
  try {
    xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (e) {
    try {
      xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (E) {
      xmlhttp = false;
    }
  }
  if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
    xmlhttp = new XMLHttpRequest();
  }
  return xmlhttp;
}