function getNumbers(){

    //Get and Parse the numbers from the input.
    let startValue = parseInt(document.getElementById("startValue").value);
    let endValue = parseInt(document.getElementById("endValue").value);

    //If values aren't int's or the start is > end error out.
    if(!Number.isInteger(startValue) || !Number.isInteger(endValue)){
        alert("Only enter numbers!");
        return;
    } else if (startValue >= endValue){
        alert("The first number needs to be smaller than the second.");
        return;
    }

    //Create an array and save it to 'numbers'.
    let numbers = generateNumbers(startValue, endValue);

    //Display results using the numbers array.
    displayValues(numbers);
    //Display results in reverse using the numbers array.
    displayValues(numbers.reverse());

    //Create an array from the starting value to the ending value.
    //Return it so we can display it.
    function generateNumbers(start, stop){
        let numbers = [];
        for (let i = start; i <= stop; i++) {
            numbers.push(i);
        }
        return numbers;
    }

    function displayValues(numArray){
        results.innerHTML = "";
        numArray.forEach(element => {
            let div = document.createElement("div");
            div.classList.add("col");
            div.innerHTML = element;
            element % 2 === 0 ? div.classList.add("even") : div.classList.add("odd");
            document.getElementById("results").appendChild(div);
        });
    }
}