javascript jquery fancybox ทำงานแค่ url เดียวครับ พอเปลี่ยน url ใหม่ ไม่ทำงาน

<li><a href="#login-box" class="login-window" >menu1</a></li>

<!-- login popup-->
<style type="text/css">
.login-popup{
	display:none;
	background: #333;
	padding: 10px; 	
	border: 2px solid #ddd;
	float: left;
	font-size: 1.2em;
	position: fixed;
	top: 50%; left: 50%;
	z-index: 99999;
	box-shadow: 0px 0px 20px #999;
	-moz-box-shadow: 0px 0px 20px #999; /* Firefox */
    -webkit-box-shadow: 0px 0px 20px #999; /* Safari, Chrome */
	border-radius:3px 3px 3px 3px;
    -moz-border-radius: 3px; /* Firefox */
    -webkit-border-radius: 3px; /* Safari, Chrome */
}

img.btn_close {
	float: right; 
	margin: -28px -28px 0 0;
}

fieldset { 
	border:none; 
}

form.signin .textbox label { 
	display:block; 
	padding-bottom:7px; 
}

form.signin .textbox span { 
	display:block;
}

form.signin p, form.signin span { 
	color:#999; 
	font-size:11px; 
	line-height:18px;
} 

form.signin .textbox input { 
	background:#666666; 
	border-bottom:1px solid #333;
	border-left:1px solid #000;
	border-right:1px solid #333;
	border-top:1px solid #000;
	color:#fff; 
	border-radius: 3px 3px 3px 3px;
	-moz-border-radius: 3px;
    -webkit-border-radius: 3px;
	font:13px Arial, Helvetica, sans-serif;
	padding:6px 6px 4px;
	width:200px;
}

form.signin input:-moz-placeholder { color:#bbb; text-shadow:0 0 2px #000; }
form.signin input::-webkit-input-placeholder { color:#bbb; text-shadow:0 0 2px #000;  }

.button { 
	background: -moz-linear-gradient(center top, #f3f3f3, #dddddd);
	background: -webkit-gradient(linear, left top, left bottom, from(#f3f3f3), to(#dddddd));
	background:  -o-linear-gradient(top, #f3f3f3, #dddddd);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#f3f3f3', EndColorStr='#dddddd');
	border-color:#000; 
	border-width:1px;
	border-radius:4px 4px 4px 4px;
	-moz-border-radius: 4px;
    -webkit-border-radius: 4px;
	color:#333;
	cursor:pointer;
	display:inline-block;
	padding:6px 6px 4px;
	margin-top:10px;
	font:12px; 
	width:200px;/*214px*/
}

.button:hover { background:#ddd; }

</style>
<!--<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>-->
<script type="text/javascript">
$(document).ready(function() {
	$('a.login-window').click(function() {
		
		// Getting the variable's value from a link 
		var loginBox = $(this).attr('href');

		//Fade in the Popup and add close button
		$(loginBox).fadeIn(300);
		
		//Set the center alignment padding + border
		var popMargTop = ($(loginBox).height() + 24) / 2; 
		var popMargLeft = ($(loginBox).width() + 24) / 2; 
		
		$(loginBox).css({ 
			'margin-top' : -popMargTop,
			'margin-left' : -popMargLeft
		});
		
		// Add the mask to body
		$('body').append('<div id="mask"></div>');
		$('#mask').fadeIn(300);
		
		return false;
	});
	
	// When clicking on the button close or the mask layer the popup closed
	$('a.close, #mask').live('click', function() { 
	  $('#mask , .login-popup').fadeOut(300 , function() {
		$('#mask').remove();  
	}); 
	return false;
	});
});
</script>
<!-- login popup-->
 <!-- Login Popup-->
 <div id="login-box" class="login-popup">
        <a href="#" class="close"><img src="<?php echo base_url();?>assets/library/images/ebook/close_pop.png" class="btn_close" title="Close Window" alt="Close" /></a>
          <form method="post" class="signin" action="<?=base_url()?>library/login/<?=$_SESSION['uni_sname']?>">
                <fieldset class="textbox">
            	<label class="username">
                <span>กรุณา Login เข้าสู่ระบบ</span>
                </label>
                <!-- -->
            	<label class="username">
                <span>Username</span>
                <input id="username" name="username" value="" type="text" autocomplete="on" placeholder="Username">
                </label>
                
                <label class="password">
                <span>Password</span>
                <input id="password" name="password" value="" type="password" placeholder="Password">
                </label>
                
                <button class="submit button" type="submit" name="send_popup">Log in</button>
                </fieldset>
          </form>
		</div>
<!-- Login Popup-->