display two layers at same time

[AMAL OMAR]

Hi all,
   
  can any one tell me why some times cant display two layers at same time, I have done some example with no problem but when I tried display my vectors layers I couldn't 
   
                                               thank you  Advice
   
  this my map file:
   
  # This is our first map file
  NAME "cis1"
  SIZE 400 300
  EXTENT 217500.00 3639400.03 217800.00 3639700.75
  UNITS METERS
   
  ####################################################
  PROJECTION 
  proj=longlat 
  ellps=WGS84 
  datum=WGS84 
  no_defs 
  END 
   
  ######################################################
  IMAGECOLOR 255 255 255
  IMAGETYPE JPEG
  SHAPEPATH "/ms4w/home/mapdata/cis/"
   
  #####################################################
  WEB
  TEMPLATE '/ms4w/var/www/htdocs/cis1.html'
  IMAGEPATH '/ms4w/var/www/htdocs/tmp/'
  IMAGEURL '/tmp/'
  END
  ######################################################
   
  LAYER
  NAME "Build" 
  STATUS default
  TYPE line
  DATA "build"
  CLASS
  STYLE
  COLOR 0 0 0
  END
  END
  END
  END
  ######################################################
   
  LAYER
  NAME "PBuild" 
  STATUS default
  TYPE line
  DATA "build1"
  CLASS
  STYLE
  COLOR 0 255 0
  END
  END
  END
  END
  ######################################################
   
  LAYER
  NAME "public pbuilding" 
  STATUS default
  TYPE line
  DATA "pbuilding"
  CLASS
  STYLE
  COLOR 255 0 0
  END
  END
  END
  END
  END

 
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