Javascript Object not defined after being created in a function

I can\’t seem to return an object from a function, the console.log inside the function prints out the property values fine but once outside the function I\’m getting \”Uncaught ReferenceError: firstOn is not defined\”

Any help would be appreciated, thanks!

myElement = document.getElementById(\"testButton\");

function Server(name,tables,startTime) {
    this.name = name;
    this.tables = tables;
    this.startTime = startTime;
}


document.forms.server1.button.onclick = function() {
    var name = document.forms.server1.servername.value;
    var tables = document.forms.server1.servertables.value;
    var startTime = document.forms.server1.servertime.value;

    var firstOn = new Server(name,tables,startTime);

    document.forms.server1.button.innerHTML = \"Saved!\";

    console.log(firstOn.name);
    console.log(firstOn.tables);
    console.log(firstOn.startTime);

    return firstOn;

};

myElement.onclick = function() {
    console.log(firstOn.name);
    console.log(firstOn.tables);
    console.log(firstOn.startTime);

};

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