助けてください、スマートは間違っています

<SCRIPT language=javascript>function CheckPost(){    if(myform.user.value="");	{     alert("请填写用户");	 myform.user.focus();	 return false;	 }	 if(myform.title.value.lengh<5){	 alert("标题不能小于5字符");	 myform.title.focus();	 return false;	 }}</SCRIPT>    <div class="form"><form action="message.php" method="post" name="myform" onsubmit="return CheckPost();">用户:<input type="text" size="10" name="user"/><br>标题:<input type="text" name="title" /><br/>内容:<textarea name="content"></textarea><br/><input type ="submit" name="submit" value="发布留言"/>

include ('./global.php');if($_POST['submit']){	$sql="INSERT INTO `message`(`id`, `user`, `title`, `content`, `lastdate`) " .			"VALUES ('','$_POST[user]','$_POST[title]','$_POST[content]',now())";			$query=$db->query($sql);			echo "<script> {window.alert('发布成功')} </script>";}$smarty->display("message.htm");