import arcpy
from arcpy import env # for setting overall extent

def LoadAllMyShapefiles(mypath):
	# Set the workspace for the ListFeatureClass function
	env.workspace = mypath
	# Use the ListFeatureClasses function to return a list of 
	#  all shapefiles.
	fcList = arcpy.ListFeatureClasses()
	print 'the workspace ' + env.workspace + ' contains ' + str(len(fcList)) + ' shapefiles.'
	# get the current map document and first dataframe
	mxd = arcpy.mapping.MapDocument("CURRENT")
	df = arcpy.mapping.ListDataFrames(mxd, '')[0]
	
	for fc in fcList: # for each shapefile found in the folder...
		pathToFC = env.workspace + '/' + fc # create a complete path that includes the shapefile
		newlayer = arcpy.mapping.Layer(pathToFC) # create a layer from the path
		arcpy.mapping.AddLayer(df,newlayer,"BOTTOM") # add the layer to the dataframe
		
	#Refresh Table of Contents
	arcpy.RefreshTOC()
	#Refresh Active View
	arcpy.RefreshActiveView()