Removing / formating existing partitions

I have two operating systems on my computer... WinXP and SUSE 8.0 pro. On HDD I have 2 NTFS partitions that I's like to get rid of. One contains the WinXP and other has random files that are not important, so practiclally formatting that won't be any lost. Q1: How do I get rid of WinXP partition, so that I am still capable of booting to suse with Lilo. Q2; How do I format NTFS partitions. Thanks. P. S.