Can't delete unwanted partition

hi all,
i've done is. past few months have been trying out different operating systems. tried install track 5 (gnome) along refit. has created couple of unwanted partitions trying delete won't let me because:
1. it's bootable
2. it's not mounted
can somebody, me?

 

do have install dvd came mac? if so, can boot (hold down option key after hear chime until disk option menu comes up) select dvd, , hit enter. brought installer. instead of installing, click utilities menu @ top , click disk utility. use want internal hd. select partition, resize another, delete another...

if don't have dvd, can try going utilities folder , opening disk utility there. may or may not let need since internal, though.

 

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