这个问题该怎么解决

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title> New Document </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="">
<meta name="Keywords" content="">
<meta name="Description" content="">
</head><body>
<form method=post action="">
<input type="text" id="t1" onblur="document.all.d1.style.display='none';" onclick="document.all.d1.style.display='';">
<DIV ALIGN="" id=d1>dddddddddddd</DIV>
</form>
</body>
</html>