Cannot read property "First Name" of undefined javascript
===

I have the following basic javascript function that I call when an onClick event occurs

    function testMe() {
    var oForm = document.forms["ExampleForm"]["First Name"].value;
    console.log(oForm);
    if(oForm == "") {
    window.alert("This is a test");
    }
    return false;
    }

However each time I click on the button, I get the error `Cannot read property "First Name" of undefined javascript` in the console. The form element `First Name` exists and does the form name `ExampleForm`

What am I overlooking or doing wrong?