<?php wp_enqueue_media();?>
<script>   
jQuery(document).ready(function(){   
	var upload_frame;   
	var value_id;   
	jQuery('.upload_button').live('click',function(event){   
		value_id =jQuery( this ).attr('id');       
		event.preventDefault();   
		if( upload_frame ){   
			upload_frame.open();   
			return;   
		}   
		upload_frame = wp.media({   
			title: 'Insert image',   
			button: {   
				text: 'Insert',   
			},   
			multiple: false   
		});   
		upload_frame.on('select',function(){   
			attachment = upload_frame.state().get('selection').first().toJSON();   
			jQuery('input[name='+value_id+']').val(attachment.url);   
		});	   
		upload_frame.open();   
	});   
});   
</script>

<input type="text" size="60" value="" name="upload" id="upload_input"/>
<a id="upload" class="upload_button button" href="#">上传</a>

<?php 
    wp_enqueue_script('media-upload');
    wp_enqueue_script('thickbox');
    wp_enqueue_script('my-upload');
    wp_enqueue_style('thickbox'); 
?>
<script>
jQuery(document).ready(function() {
    jQuery('#upload_image_button').click(function() {
     formfield = jQuery('#upload_image').attr('name');
     // show WordPress' uploader modal box
     tb_show('', '<?php echo admin_url(); ?>media-upload.php?type=image&amp;TB_iframe=true');
     return false;
    });
    window.send_to_editor = function(html) {
     // this will execute automatically when a image uploaded and then clicked to 'insert to post' button
     imgurl = jQuery('img',html).attr('src');
     // put uploaded image's url to #upload_image
     jQuery('#upload_image').val(imgurl);
     tb_remove();
    }
});
</script>

<input name="pic" id="upload_image" type="text" value="" />
<input id="upload_image_button" type="button" value="上传图片" />