[Tutor] When I run this code, it just keeps repeating.

[Nathan Pinno]

When I run the following code it just keeps repeating. Here is a screen shot showing what I mean:
Mini Calculator
By Nathan Pinno

CALCULATE MENU
1) Add
2) Subraction
3) Multiplication
4) Division w/o remainder
5) Division with remaider
6) Exponation
7) Square roots
9) Exit
Option: 5
First number:4
Second number:2
4 / 2 =  2  R  0
First number:3
Second number:6
3 / 6 =  0  R  3
First number:5
Second number:6
5 / 6 =  0  R  5
First number:

Here is the relevant code:
# This is a small calculator.
def menu():
    print "CALCULATE MENU"
    print "1) Add"
    print "2) Subraction"
    print "3) Multiplication"
    print "4) Division w/o remainder"
    print "5) Division with remaider"
    print "6) Exponation"
    print "7) Square roots"
    print "9) Exit"

def cal():
    global cal_opt
    cal_opt = int(raw_input("Option: "))

print "Mini Calculator"
print "By Nathan Pinno"
print
menu()
cal()
while cal_opt != 9:
    if cal_opt == 1:
        X = input("First number:" )
        Y = input("Second number:" )
        print X, "+", Y, "= ",X + Y
    elif cal_opt == 2:
        X = input("First number:" )
        Y = input("Second number:" )
        print X, "-", Y, "= ",X - Y
    elif cal_opt == 3:
        X = input("First number:" )
        Y = input("Second number:" )
        print X, "*", Y, "= ",X * Y
    elif cal_opt == 4:
        X = input("First number:" )
        Y = input("Second number:" )
        if Y == 0:
            print "Division by zero ot allowed!"
            Y = input("Second number:" )
        else:
            print X, "/", Y, "= ",X / Y
    elif cal_opt == 5:
        X = input("First number:" )
        Y = input("Second number:" )
        if Y == 0:
            print "Division by zero ot allowed!"
            Y = input("Second number:" )
        else:
            print X, "/", Y, "= ",X / Y," R ", X % Y
    elif cal_opt == 6:
        X = input("First number:" )
        Y = input("Power:" )
        print X, "**", Y, "= ",X**Y
    elif cal_opt == 7:
        X = input("Number to find the square root of:" )
        print "The square root of", X, " = ",X**0.5
    else:
        print "That's not an option. Try again."
        menu()
        cal()
print "Goodbye"

How do I stop this, and make it go back to the main menu?

Thanks in advance,
Nathan
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