jquery - zclip copy text to clipboard not working -

i have in .jade:

.col-md-9     h4#enquiry-details enquiry details .col-md-1     a#copy-enquiry(href='#') copy 

then in javascript:

$(document).ready(               function() {         $('a#copy-enquiry').zclip({             path:'/javascripts/zeroclipboard.swf',             copy:$('h4#enquiry-details').text(),          });      } ); 

i have included jquery , jquery.zclip.js script in header.

somehow copy clipboard still not working. ideas?