Please look at the code highlighted below and suggest a correction that would allow the firstName and lastName fields to concatenate in the "Employee Name" field.

Also, please help me understand the correct syntax for ADDING the FICA, State and Federal tax fields together, instead of concatenating.

Please see screenshot below.

function calculate(){

//This expression checks for a

if(document.theForm.firstName.value == "" || document.theForm.lastName.value == "")

alert("Both FIRST and LAST names are required.");

else firstName && lastName;

//Field for entering hours worked, 40 hours and under.

if(document.theForm.regHours.value 40)

alert("Please enter Regular Hours number between 1-40.")

else

regHours = document.theForm.regHours.value;

// Field for entering hour worked, over 40 hours.

if(document.theForm.overHours.value 40)

alert("Please enter Overtime Hours number between 0-40.")

else

overHours = document.theForm.overHours.value;

//Field for entering an hour rate.

if(document.theForm.hourlyRate.value 99.99)

alert("Please enter a valid Hourly Rate.");

else

hourlyRate = document.theForm.hourlyRate.value;

//Determines the regular pay.

if(hourlyRate && regHours)

regPay = document.getElementById('regPay').value = regHours * hourlyRate;

//Determines the overtime pay.

if(overHours && regHours && hourlyRate)

overtimePay = document.getElementById('overtimePay').value = (overHours * (hourlyRate * 1.5));

//Determines the gross pay. (regularPay + overtimePay)

if(regPay > 0)

grosspay = document.getElementById('grossPay').value = regPay + overtimePay;

//Field for entering the FICA tax rate.

if(document.theForm.fica.value

alert("Please enter a valid FICA Tax Rate");

else

fica = document.theForm.fica.value;

//Field for entering the state tax rate.

if(document.theForm.stateRate.value

alert("Please enter a valid State Tax Rate above zero.");

else

stateRate = document.theForm.stateRate.value;

//Field for entering the federal tax rate.

if(document.theForm.fedRate.value

alert("Please enter a valid Federal Tax Rate above zero.");

else

fedRate = document.theForm.fedRate.value;

//Field for entering the combined tax obligation.

if(fica && stateRate && fedRate)

totalTax = document.getElementById('totalTax').value = fica + stateRate + fedRate;

else

alert("One of the tax rates is incorrect.");

//Supposed to combine the workers' first and the last names.

if(firstName && lastName)

empName = document.getElementById('empName').value = firstName.concat(lastName);

else

alert("Something went wrong.");

//Calulate the 'take home' pay.

if(grossPay

alert("There's a problem with one of the previous fields.")

else

netPay = document.getElementById('netPay').value = grossPay + totalTax;

}

First Name

Last Name

Regular Hours Worked (between 1-40)

Overtime Hours (between 0-40)

Hourly Rate (between 0 - 99.99)

Regular Pay

Overtime Pay

Gross Pay

FICA Tax Rate (Ex: 5.65)

State Tax Rate (Ex: 5.75)

Federal Tax Rate (Ex: 28.00)

Total Taxes

Employee Name

Net Pay

First Name john Last Name doe Regular Hours Worked (between 1-40) 10 Overtime Hours (between 0-40) 2 Hourly Rate (between 0 - 99.99) 10 Regular Pay 100 Overtime Pay 30 Gross Pay 130 FICA Tax Rate (Ex: 5.65) 2 State Tax Rate (Ex: 5.75) 3 Federal Tax Rate (Ex: 28.00) 4.0 Total Taxes 234.(0 Net Pay Calculate