Header problem

I am using a theme with custom header options but when I try to upload a header image I get this.

Help

Warning: copy() [function.copy]: SAFE MODE Restriction in effect. The script whose uid is 713884 is not allowed to access /www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-content/uploads owned by uid 2001 in /www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-admin/includes/file.php on line 348

Warning: copy(/www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-content/uploads/banner.bmp) [function.copy]: failed to open stream: No such file or directory in /www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-admin/includes/file.php on line 348

Warning: getimagesize() [function.getimagesize]: Unable to access /www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-content/uploads/banner.bmp in /www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-admin/custom-header.php on line 665

Warning: getimagesize(/www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-content/uploads/banner.bmp) [function.getimagesize]: failed to open stream: No such file or directory in /www/zxq.net/l/i/b/libmil/htdocs/blogosphere/wp-admin/custom-header.php on line 665