Jquery Event in JS : <p>I have a script to select form options. How can I change the document ready function to Javascript instead of using Jquery? </p>

<pre><code>$(document).ready(function () {
    function FormFill() {
            if {
                var el1 = document.getElementsByName("FormOption1")[0];
            if(typeof el1 !== 'undefined') {el1 = 1;}         
                var el2 = document.getElementsByName("FormOption2")[0];
            if(typeof el2 !== 'undefined') {el2 = 2;}  
            }, 100);
        }
    }
setTimeout(FormFill,5000);
});
</code></pre>
