Focus first form field

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This focuses input on the first non-hidden text or textarea field on the first form. This is short and gets the job done.

...
<script type="text/javascript">
// This will focus first non-hidden text or textarea field on the first form.
function focus_first ()
{
    var form = document.forms[0];
    if (form != null && form.elements[0] != null)
    {
        for (var i = 0; i < form.elements.length; ++i)
        {
            var field = form.elements[i];
            if (field.type!="hidden" && (field.type=="text" || field.type=="textarea"))
            {
                field.focus();
                break;
            }
        }
    }
}
</script>
</head>
<body onload="focus_first()">
...