Changeing Address of Photos after calling a function of a class

[eluser]arlabbafi[/eluser]
hello
Address of photos will be cheage after go to this address
http://localhost/CI/subgroup/showgroup/15
but before with this address is true
http://localhost/CI/
in this address
http://localhost/CI/subgroup/showgroup/15
if add ../../ to my Start address of photo then photos shown Correctly
what is problem ?