var adv_arr = new Array(); //定义广告数组
var tdate   = new Date();//当前日期

//默认广告
adv_arr[0] = new Array("<a href=\"http://www.uscity.cn\" target=\"_blank\" title=\"中国城市生网联盟\"><img src=\"/uploadfile/adv/1212063152440.gif\" width=\"555\" height=\"60\" alt=\"中国城市生网联盟\" border=\"0\" /></a>","","");

//队列广告

adv_arr[1] = new Array("<a href=\"/advs/adv_click.php?advid=46\" target=\"_blank\" title=\"\"><img src=\"/uploadfile/adv/1272886368644.gif\" width=\"550\" height=\"60\" alt=\"\" border=\"0\" /></a>","2008-12-31","2012-09-26");
if(adv_arr.length>1){	//如果队列中有广告
	for(i=1;i<adv_arr.length;i++){
		var sconverted = Date.parse(adv_arr[i][1]);
		var econverted = Date.parse(adv_arr[i][2]);
		var sdate = new Date(sconverted);
		var edate = new Date(econverted);
		if (isNaN(sdate))   
		{    
			var arys= adv_arr[i][1].split('-');   
			sdate = new Date(arys[0],--arys[1],arys[2]);   
		} 
		if(isNaN(edate)){
			var arys = adv_arr[i][2].split('-');
			edate = new Date(arys[0],--arys[1],arys[2],23,59,59);
		}
		if(tdate >= sdate && tdate <= edate){ //如果队列中广告有效期在当前日期则显示广告
			document.write(adv_arr[i][0]);
			break;
		}
	}
	if(i==adv_arr.length)	//没有有效期广告,则显示默认广告
		document.write(adv_arr[0][0])
}else{	//否则显示默认广告
	document.write(adv_arr[0][0]);
}