image error message no idea how to fix

hi!

i am brand new to wordpress, i am not an html person so please speak slowly. every time i try to put an image in a post i get this message:

““DSC00009.JPG” has failed to upload due to an error
The uploaded file could not be moved to /home/wsjill/public_html/blog/wp-content/uploads/2010/06″

my first post with images was successful, i don’t know what happened. i didn’t change anything between my first post and now.

here’s my blog: https://www.wordshopdenver.com/blog

update: images uploading fine to my text box in my sidebar. so i tried again inside of a post and got this message:

“
Warning: imagecreatefromstring() [function.imagecreatefromstring]: Passed data is not in ‘JPEG’ format in /home/wsjill/public_html/blog/wp-includes/media.php on line 253

Warning: imagecreatefromstring() [function.imagecreatefromstring]: Couldn’t create GD Image Stream out of Data in /home/wsjill/public_html/blog/wp-includes/media.php on line 253

Warning: imagecreatefromstring() [function.imagecreatefromstring]: Passed data is not in ‘JPEG’ format in /home/wsjill/public_html/blog/wp-includes/media.php on line 253

Warning: imagecreatefromstring() [function.imagecreatefromstring]: Couldn’t create GD Image Stream out of Data in /home/wsjill/public_html/blog/wp-includes/media.php on line 253

Warning: imagecreatefromstring() [function.imagecreatefromstring]: Passed data is not in ‘JPEG’ format in /home/wsjill/public_html/blog/wp-includes/media.php on line 253

Warning: imagecreatefromstring() [function.imagecreatefromstring]: Couldn’t create GD Image Stream out of Data in /home/wsjill/public_html/blog/wp-includes/media.php on line 253
58″

it IS a .jpg! i am looking at it right now! please help!