Fix #2539: add a new attachment page has secure/not secure error in ie6. This will fix the error for all upload progress forms over HTTPS in IE.
Fix #2539: add a new attachment page has secure/not secure error in ie6. This will fix the error for all upload progress forms over HTTPS in IE.

svn commit r30269

silverorange/site,nburka/site,nburka/site,silverorange/site