Javascript select() value

I am sure this is super easy, but for some reason I just can't figure this one out. I need to create a form on the page with the following fields and rules. If the user submits a form but the rules are broken for any field, the behavior listed must be done to advise the user. I am not allowed to use jQuery. Field01 & Field02 is one box. Field03 & Field04 is one box. * Field01: "Username" - Rule01: Cannot be empty, Behavior01: Put focus on it using focus(). * Field02: "Username" - Rule02: Cannot be empty, Behavior02: Alert the user that "username is required". * Field03: "Birthyear" - Rule03: Must be numeric, Behavior03: Select the value using select(). * Field04: "Birthyear" - Rule04: Must be between 1900 - 2012, Behaviour04: Turn the Birthyear text box background color to yellow. This is what I have so far... Struggling with the Field03 & Field04. Does anyone know how to approach this? HTML:
Birth Year:

JS in Separate file: document.getElementById("username").focus(); // focus on text box function validateForm(){ var x=document.forms["myForm"]["username"].value; if (x==""){ alert("Username Required!"); // focus on text box document.getElementById("username").focus(); return false; // validation failed }else{ return true; // validation success } }
Take a look at this answer and fiddle for a general outline of how to setup the validation process (sans jQuery).

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