Nokiaqueen you are welcome!
TO SET YOUR 800 X 480 JPEG WALLPAPERS AS YOUR LOCKSCREEN BACKGROUND FOLLOW THIS INSTRUCTION!
make sure you choose the correct path to the folder as following
/home/user/MyDocs/.images/wallpapername.JPG
make sure jpg is in capital then make sure you save .ini and write killall qtlockscreen in x-terminal and thats it done for portrait mode make sure you have 480 X 800 pictures and you can still use jpeg files as much as you write .jpg in capital like this .JPG
this for the people who dont have much knowledge with this or are having trouble i have tried to be as simple as i can hope this helps!