What is wrong with my Javascript Calculator? [closed]

I made a JavaScript calculator to calculate the price for counseling. I had it working in the old webpage and I'm converting to Drupal 7. Even though it worked before, I'm recieving an error now.

function feecalculator() {

    this.family = 0;
    this.income = 0;

    this.familylimits = Array();
    this.familylimits[1] = 10900;
    this.familylimits[2] = 14700;
    this.familylimits[3] = 18400;
    this.familylimits[4] = 22200;
    this.familylimits[5] = 25900;
    this.familylimits[6] = 29600;
    this.familylimits[7] = 33400;
    this.familylimits[8] = 37100;
    this.familylimits[9] = 40800;
    this.familylimits[10] = 44600;
    this.familylimits[11] = 48300;
    this.familylimits[12] = 52100;

    this.init = function()
    {

        $('#family, #income').keypress(function(event) {
            return feecalc.inputLimiter(event,'Numbers');                       
        });

        $('#calcbutton').bind('click', this, function(e) {
            e.data.getFee();
        });

        $('#family').bind('change blur', this, function(e) {

            if ($(this).val()>12)
            {
                $(this).val(12)
            }

            e.data.family = $(this).val();
            //e.data.getFee();

        });

        $('#income').bind('change blur', this, function(e) {

            value = $(this).val();
            if ( value % 100 != 0 )
            {
                count = 0;
                while( value % 100 != 0 )
                {
                    value++;
                    count++;
                }

                if (count<=50)
                {
                    $(this).val(value);
                }
                else
                {
                    value = value-count;
                    while( value % 100 != 0 )
                    {
                        value--;
                    }                   
                    $(this).val(value);
                }
            }


            e.data.income = $(this).val();
            //e.data.getFee();

        });

    }


    this.getFee = function()
    {
        var copayfee;
        var copayfee2;
        var copayfee3;
        if ( this.income>0 && this.family>0 )
        {
            if (this.income>=this.familylimits[this.family])
            {
                copayfee = Math.round( (this.income * 0.001)/this.family );
                copayfee2 = Math.round(copayfee * 1.5);
                copayfee3 = Math.round(copayfee * 2);

                if (fee>100) fee=100;

                $('#fee').text('$'+copayfee);
                $('#fee2').text('$'+copayfee2);
                $('#fee3').text('$'+copayfee3);
                $('#copaytable').show();            
            }
            else
            {
                copayfee = '0';
                copayfee2 = '0';
                copayfee3 = '0';
            }

            $('#fee').text('$'+copayfee);
            $('#fee2').text('$'+copayfee2);
            $('#fee3').text('$'+copayfee3);
            $('#copaytable').show();
        }
        else if ( this.income==0 && this.family==0 )
        {
            alert('Please enter your household income and your family size.');
        }
        else if ( this.income==0)
        {
            alert('Please enter your household income.');
        }   
        else if ( this.family==0 )
        {
            alert('Please enter your family size.');
        }                   

    }


    this.inputLimiter = function(e,allow) 
    {
        var AllowableCharacters = '';

        if (allow == 'Letters'){AllowableCharacters=' ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';}
        if (allow == 'Numbers'){AllowableCharacters='1234567890';}
        if (allow == 'NameCharacters'){AllowableCharacters=' ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-.\'';}
        if (allow == 'NameCharactersAndNumbers'){AllowableCharacters='1234567890 ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-\'';}

        var k = document.all?parseInt(e.keyCode): parseInt(e.which);
        if (k!=13 && k!=8 && k!=0){
            if ((e.ctrlKey==false) && (e.altKey==false)) {
            return (AllowableCharacters.indexOf(String.fromCharCode(k))!=-1);
            } else {
            return true;
            }
        } else {
            return true;
        }
    }

}

//<![CDATA[
var feecalc = null;$(document).ready(function(e) { feecalc = new feecalculator(); feecalc.init();});
//]]>