Can't change portrait

Hi, just trying to change my portrait (been there for like 2 years...) but when I tried to change the picture this came up:

Warning: copy(/home/dvdtown/public_html/mytown/media/portrait/10186.jpg) [function.copy]: failed to open stream: Permission denied in /home/dvdtown/public_html/mytown/exec/portrait_edit.php on line 50

Warning: copy(/home/dvdtown/public_html/mytown/media/portrait/10186.jpg) [function.copy]: failed to open stream: Permission denied in /home/dvdtown/public_html/mytown/exec/portrait_edit.php on line 30

Warning: imagejpeg() [function.imagejpeg]: Unable to open '/home/dvdtown/public_html/mytown/media/portrait/10186.jpg' for writing in /home/dvdtown/public_html/mytown/exec/portrait_edit.php on line 38

Warning: Cannot modify header information - headers already sent by (output started at /home/dvdtown/public_html/mytown/exec/portrait_edit.php:50) in /home/dvdtown/public_html/mytown/exec/portrait_edit.php on line 59

I tried about 5 times with different pictures and kept getting the same thing. Anyways, if you have any info I'm all ears, or eyes... as all responses would be written... unless someone read it to me... that would be odd.