function ranArray(n)
{
        var a,r,l=n.length,x,d=new Array(l);
        for(x=l-1;x>=0;x--)
        {
                r=Math.floor(Math.random()*(x+1));
                d[x]=n[r];
                n[r]=n[x];
        }
        return d;
}
function SelectRandAll(form){
	var k=[];
	for(var i=0;i<form.id.length;i++){
		var e = form.id[i];
		e.checked = false;
		k[i]=i;
	}
	var newform=ranArray(k);
	var l=[];
	for (var i=0;i<newform.length && i<form.id.length/2;i++){
		l[i]=newform[i];
		var e = form.id[newform[i]];
		e.checked = true;
	}
eval("document.lbplay.submit();");
}

function formRSL(form)
{
	var ChkValue="";
	var maxsong=30;
	var selectsong=0;
	if(form.id!=null)
	{
		for(var i=0;i<form.id.length;i++)
		{
			if(form.id[i].checked)
			{
				if(selectsong==0) {
					ChkValue+=form.id[i].value.toString();
				} else {
					ChkValue+=","+form.id[i].value.toString();
				}
				selectsong++;
			}
		}
		if(selectsong>0)
		{
			return ChkValue;
		}
		else
		{
			alert("ÇëÏÈÑ¡¶¨ÄúËùÐèÒªµÄ¸èÇú");
			return false;
		}
	}
	else
	{
		alert("ÕÒ²»µ½ÄãÏëÒªµÄ¸èÇú");
		return false;
	}
}
function submit_play(form){
	var sid=formRSL(form);
	if (sid) {
		var playurl="/playsong.asp?id="+sid;
		window.open(playurl, "s7s2play");
	}
}

function CheckOthers(form){
	 for (var i=0;i < form.elements.length;i++){
		var e = form.elements[i];
		if (e.checked == false){
			e.checked = true;
		}else{
			e.checked = false;
		}
	 }
}

function CheckAll(form){
	 for (var i=0;i < form.elements.length;i++){
		var e = form.elements[i];
		e.checked = true;
	 }
}

function copyToClipBoard(){
    var clipBoardContent="";
    clipBoardContent+=this.location.href;
    window.clipboardData.setData("Text",clipBoardContent);
    alert("地址复制成功！你可以直接粘贴到QQ或MSN上推荐给好友");
 }