var expandOrCollapse = function(event){
	event.cancelBubble  =  true
	var obj =event.srcElement
	if(!obj.level&&!obj.tagName.toLowerCase()=="img"){
		return;
	}else if(obj.tagName.toLowerCase()=="img"){
		obj = obj.parentElement
	
	}
	
	objImg = obj.childNodes[0]
	obj = obj.childNodes[2]

	if(obj){
		if(obj.className =="collapse"){
			obj.className = "expand"
			objImg.src = "images/toc-minus.png"
		}else{
			obj.className = "collapse"
     		objImg.src = "images/toc-plus.png"
		}
	
	}
}
var loadEventAction = function(){
  var arr = document.getElementsByTagName('li')
  for(var i=0;i<arr.length;i++){
  	 arr[i].attachEvent('onclick',expandOrCollapse)
  }
  for(var i=0;i<arr.length;i++){
  	 arr[i].click()
  }
}
var loadIframeUrl = function(url){

	
	
}