Tilfældigt billede ved indlæsning af side

lucas_index.html

<div class="header">
        <img id="logo" src="img/top_banner.png" alt="" draggable="false">
        <img class="random" name="rdmImg" src="" alt="" draggable="false">
        <script language="javascript">

            var x = Math.floor((Math.random() * 5) + 1);
            x -= 1;

            var randomimages=new Array()

            randomimages[0]="img/banner/rdm1.jpg"
            randomimages[1]="img/banner/rdm2.jpg"
            randomimages[2]="img/banner/rdm3.jpg"
            randomimages[3]="img/banner/rdm4.jpg"
            randomimages[4]="img/banner/rdm6.jpg"

            document.images.rdmImg.src=randomimages[x];

        </script>
    </div>