Combine 2 similar Functions which use IF Java script

I have created two functions that run a similar set of IF statements, one shows the cost of a game, the other its name. I have used "onclick" to display both values in my form. It all works but suffers from bloat. Is there a way to combine both functions to shorten the script?

        function GameTitle() {
var textboxValue = document.getElementById("game_id").value;
    var message;
    if (textboxValue == 1) {
        message = "Fantasy World";
    } else if (textboxValue == 2) {
        message = "Sir Wags A Lot";
    } else if (textboxValue == 3) {
        message = "Take a Path";
    } else if (textboxValue == 4) {
        message = "River Clean Up";
    } else if (textboxValue == 5) {
        message = "PinBall";
    } else if (textboxValue == 6) {
        message = "Ghost girl";
    } else if (textboxValue == 7) {
        message = "Dress Up";
    } else if (textboxValue == 8) {
        message = "Where is my hat?";
    } else {
        message = "Invalid ID";
    }
document.getElementById("game_title").value = message;
}

//Display price of Game
    function Cost() {
var textboxValue = document.getElementById("game_id").value;
    var cost;
    if (textboxValue == 1) {
        cost = "0.99";
    } else if (textboxValue == 2) {
        cost = "0.99";
    } else if (textboxValue == 3) {
        cost = "1.99";
    } else if (textboxValue == 4) {
        cost = "1.99";
    } else if (textboxValue == 5) {
        cost = "3.99";
    } else if (textboxValue == 6) {
        cost = "3.99";
    } else if (textboxValue == 7) {
        cost = "1.99";
    } else if (textboxValue == 8) {
        cost = "1.99";
    } else {
        cost = "Invalid ID";
    }
document.getElementById("cost").value = cost;
}