function refreshnewdata(){};

var maxChild = 50; //最多允许50个元素
var itervalTime = 60000; //请求间隔时间
//页面加载完成后执行
$(window).addEvent('load',function(){					  
 var itv = setInterval(function(){
 		var postData = $('regform').toQueryString(); 
		postData +=  '&lastid='+Number($('lastid').value);
		new Ajax('/?ajax=1',{
					method    :'get',
					onComplete:function(text){
						var obj ;
						try{
							obj = Json.evaluate(text)
						}catch(e){
							alert('json 数据错误！');
							$clear(itv);   //结束请求
							return ;
						}
						var wrap = $('refreshdata');
						
						var children = $(wrap).getChildren();						
						var tmp = document.createElement('div');
						tmp.innerHTML = obj.html;						
						var el  = $(tmp).getFirst();
						if(!el){
							return false;
						}
						if(children.length == 0){
							$(wrap).innerHTML = '';							
							$(el).injectInside(wrap);
						}else{													
							$(el).injectTop(wrap);	
						}
						$('lastid').value = obj.lastid;							
					}
				  }).request(postData);
	},itervalTime);
});