CMIS 102

Write a Javascript program to assist the citizens of Browserania with their taxes.

The program requests the user's taxpayer id (which is just a string).
Then the user's filing status is prompted for.  Valid filing statuses
are S for single, M for married, and J for joint.  The program will
repeatedly prompt for a filing status until the user enters a valid one.  
Then the gross income is prompted for and read.
Then the number of exemptions is input by the
user, which can be any number from 0 through 10 
(must be error-checked in a loop).

The program then displays the taxpayer ID, the gross income, the
taxable income (which is the gross income minus the standard deduction
of $3000 and minus $1000 per exemption), the tax rate (see table
below), and the tax due (which the taxable income multiplied by the
tax rate). If taxable income is negative, no tax is due.  

These figures and this process are wholly imaginary.  They are not
approved by the IRS.  It's how people do taxes in Browserania.

Tax rates:
Filing status     Gross Income range        Tax rate
	  S             0-$10000               15%
                        10000-                 22%
	  M             0-8000                 16%
                        8000-                  31%
	  J             0-7000                 17%
	                7000-25000             24%
                        25000-                 33%


Make sure your program is calculating correctly (test it with inputs
whose value you have hand-calculated).  There is a maximum fine of one
trillion Browseranian $d0llars for income tax evasion.  And your software
company will have to share in those costs if it is the cause of
erroneous tax reporting.

Turn in a print out of the program.
Email your .html file to your instructor.