if(!document.all){
	HTMLElement.prototype.__defineGetter__("children", 
		 function () { 
			 var returnValue = new Object(); 
			 var number = 0; 
			 for (var i=0; i<this.childNodes.length; i++) { 
				 if (this.childNodes[i].nodeType == 1) { 
					 returnValue[number] = this.childNodes[i]; 
					 number++; 
				 } 
			 } 
			 returnValue.length = number; 
			 return returnValue; 
		 } 
	 );
}
function randomInt(num1){
	return Math.floor(Math.random()*num1);
};
//函数每隔t毫秒执行一次
Function.prototype.runEach = function(t){
	var A = this;
	var B = Array.prototype.slice.call(arguments,1);
	var f = function(){
		A.apply(null,B);
	};
	return setInterval(f, t);
};
//函数在t毫秒延时后执行
Function.prototype.runAfter = function(t){
	var A = this;
	var B = Array.prototype.slice.call(arguments,1);
	var f = function(){
		A.apply(null, B);
	};
	return setTimeout(f,t);
};
var picCount=document.getElementById("homePushName").children.length;
var canRoll=true;
var rollId=randomInt(picCount);
var timeTag=0;
function doRoll(){
	//是否符合计时条件，如果不符合直接进入下一次等待,设置状态值
	if(canRoll){
		timeTag+=10;
		if(timeTag>2500){
			timeTag=0;
			rollId=(rollId>picCount-2)?0:(rollId+1);
		}
	}
	//显示当前的图片
	for(var i=0;i<picCount;i++){
		
		if(document.getElementById("homePushShow"+i).style.display != ((i==rollId)?"block":"none")){
			document.getElementById("homePushShow"+i).style.display = ((i==rollId)?"block":"none");
		};
		if(document.getElementById("homeAd"+i).className!=((i==rollId)?"now":"")){
			document.getElementById("homeAd"+i).className=(i==rollId)?"now":"";
		};
	}
}
for(var i=0;i<picCount;i++){
	document.getElementById("homeAd"+i).onmouseover=function(){
		canRoll=false;
		rollId=parseInt(this.id.replace("homeAd",""));
		timeTag=0;
	}
	document.getElementById("homeAd"+i).onmouseout=function(){
		canRoll=true;
		timeTag=0;
	}
}
doRoll.runEach(2);