function checkdata(){
username=document.getElementById("username").value;
thepass=document.getElementById("thepass").value;
var mypoint=document.getElementsByName("point");
myreview=document.getElementById("myreview").value;
var errormsg=document.getElementById("errormsg");

if (username==""){
	errormsg.innerHTML="用户名不能为空哦!";
	document.getElementById("username").focus();
	return false;
	}
	
if (thepass==""){
	errormsg.innerHTML="密码不能为空哦!";
	document.getElementById("thepass").focus();
	return false;
	}

if (mypoint[0].checked==false&&mypoint[1].checked==false&&mypoint[2].checked==false&&mypoint[3].checked==false&&mypoint[4].checked==false){
	errormsg.innerHTML="请为商家评分";
	return false;
	}
	
if (myreview==""){
	errormsg.innerHTML="评论内容不能为空哦!";
	document.getElementById("myreview").focus();
	return false;
	}
return true;
}