function SelectAll(F){
	//全选
	var l = F.elements.length;
	var e;
	for(var i = 0; i < l; i++){
		e = F.elements[i];
		if(e.type == "checkbox"){
			e.checked = true;
		}
	}
}

function ReSelect(F){
	//反选
	var l = F.elements.length;
	var e;
	for(var i = 0; i < l; i++){
		e = F.elements[i];
		if(e.type == "checkbox"){
			if(e.checked)
				e.checked = false;
		else
		e.checked = true;
		}
	}
}

function Play(Param){
	//播放选择
	var a = "";
	var length = Param.elements.length;
	var c = 0;
	for(var i = 0; i < length;i++){
		if(Param.elements[i].type == "checkbox"){
			if(Param.elements[i].checked){
				c++;
				if(a == ""){
					a = Param.elements[i].value;
				}else{
					a = a + "_" + Param.elements[i].value;
				}
			}
		}
	}
		
	if(c == 0){
		alert("请至少选择一首歌曲！");
	}else if(c > 100){
		alert("对不起！一次最多允许点播100首歌曲！");
	}else{
		var PlayWin = window.open("/PlaySong.asp?id=" + a,"","");
		if(PlayWin == null){
			alert("不能打开播放窗口，请检查您的浏览器是否已经设置了弹出窗口拦截！");
		}		
	}	
	
}