How to submit some hidden values along with a drupal webform? Our example. We have job node (nid 1) and we want to go to a webform to apply for the job. So we build a link on our node pointing to the webform node (nid 2).
In the node template type quickly a url: node , nid webform, nid job node
print l('Apply for this job', 'node/2/1');