Cutting hair to make it all of equal length is permissible so long as one does not resemble the kuffaar
Question

                What is the ruling on muslim men cutting there hair is there limitaions like it has to be done equall length..Please explain this
Praise be to Allah. 
          Cutting hair to make it all of equal length, reaching 
          the shoulders or ears is OK, so long as that does not involve resembling 
          the kuffaar. Resembling the kuffaar is haraam even if it is in regard 
          to something that in principle is permitted. 
 
          With regard to cutting some of the hair and leaving some 
          of it, that is not permitted. This is the hairstyle which was forbidden 
          by the Prophet 
          
          (peace and blessings of Allaah be upon him), as is narrated in Saheeh 
          al-Bukhaari and elsewhere. 
 
          This ruling applies to both men and women. It is OK to 
          cut the hair and make it of equal length so long as that does not involve 
          resembling the kuffaar, or making men resemble women and vice versa. 
          Women should not cut their hair short in a manner that resembles men’s 
          hairstyles.