Python Metric Weight Conversion

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#==============MODULES================#
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#=====================================#
#==============VARIABLES==============#
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var = 2.2046
menus = ["(1) Lbs to Kgs", "(2) Kgs to Lbs", "(3) Exit      "

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#==============FUNCTIONS==============#
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#defines menu
def menu(parameter):
    print "     +==============+"
    print "     |  CONVERSIONS |"
    print "     |     MENU     |"
    print "     |==============|"
    for word in parameter:
        print "     |%s|" % word
        print "     |--------------|"

#defines algorithm for Lb to Kg
def lb2kg(var, weight):
    kilograms = (weight / var)
    print "%s lbs is %s kgs" % (weight, kilograms)

#defines algorithm for Kg to Lb
def kg2lb(var, weight):
    lbs = (weight * var)
    print "%s kgs is %s lbs" % (weight, lbs)

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#=============MAIN PROGRAM============#
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def main():
    menu(menus)
    choice = input("Please make a selection(1-3): ")

    if choice == 1:
        lb2kg(var, weight)
    elif choice == 2:
        ks2lb(var, weight)
    elif choice == 3:
        print "Exiting Program. Goodbye"
        return
    else:
        print "Invalid Selection"
        return main()