Hi,  all! , i  have a problem  , please help and see it,  THX!

chrome sas: Uncaught TypeError: Cannot call method 'db' of undefined

I HAVE INCLUDE :
<script src="scripts/upload.js"></script> <script src="/_utils/script/jquery.couch.js"></script>

db = $.couch.db("doc"); function uploaddoc() { $('<h3>New attachment</h3><table style="border:0px;"><tr valign="top"><td style="border:0px;"><form id="attachment-form" name="attachment_form" content-type="multipart/form-data"><input id="_attachments" type="file" name="_attachments"/></form></td><td style="border:0px;">File description:</td><td style="border:0px;"><form id="att-descr-form" name="att_descr_form"><textarea name="attachdescr" style="height:50px; width:450px;" ></textarea></form></td><td style="border:0px;"><button id="upfly">Upload File</button><br/></td></tr></table>').appendTo('#uploadfly'); $("#upfly").click(function() { //alert("saved!1"); //alert("saved!2"); doc = new Object; doc.date = Date().toString().substring(3, 15); doc._attachments = document.getElementById("_attachments"); db.saveDoc(doc, { success: function() { alert("saved!"); }, }); }); }