I'm using drupal6 and face the problem in image uploading display this error "warning: imagejpeg() [function.imagejpeg]: Unable to open 'sites/default/files/imagefield_thumbs/06_1.jpg' for writing: Permission denied in /var/www/www.sierraglow.sg/htdocs/sites/all/modules/imageapi/imageapi_gd.module on line 84." so plz tell me solution................