function Addcommont(){
    var f=document.myform;
    var username=f.commuser.value;
    var anonymous=f.b_b_anonymous;
    var content=f.b_c_content.value;
	if((username=='' || username=='请输入用户名') && anonymous.checked==false){
		halt('请至少输入或选择一种身份');
		return false;
	}else{
		 if(content.length<3 || content=='此处输入评论内容'){
			 halt('评论内容太短或不能为空！');
			 return false;
		 }
	}
    if(nsid==''){
        halt('参数错误！');
		return false;
    }
	if(anonymous.checked){
		username='匿名网友';
	}
	var x = new Ajax('commentmsg', 'XML');
	halt('正在发送，请稍等...');
	x.post(subfile,'nsid='+nsid+'&username='+escape(username)+'&content='+escape(content)+'&nodeid='+nodeid+'&subject='+subject+'&siteid='+siteid+'&url='+purl, function (s){
	getbyid('commentmsg').innerHTML = s.lastChild.firstChild.nodeValue;
	});
}

//返回信息提示
function halt(sendmsg){
	if(sendmsg!=''){
	    var x = new Ajax('commentmsg', 'XML');
	    getbyid('commentmsg').innerHTML="<div id=load style='padding-bottom:2px;margin:5px;border:#98b1c8 1px solid; background-color:#990000; z-index:60;font-size:12px;color:#ffffff;width:150px'>"+sendmsg+"</div>";
	}
}