input自动获取焦点

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>test javascript</title>
    <script type="text/javascript">
        window.onload = function() {
            var EventUtil = {
                addhandler:function(element,type,handler) {
                    if(element.addEventListenter) {
                        element.addEventListenter(type,handler,false);
                    } else if (element.attachEvent) {
                        element.attachEvent("on"+type,handler);
                    } else {
                        element["on"+type] = handler;
                    }
                },                getEvent:function(event) {
                    return event?event:window.event;
                },                getTarget:function() {
                    return event.target || event.srcElement;
                },                preventDefault:function() {
                    if(event.preventDefault) {
                        event.preventDefault();
                    } else {
                        event.returnValue = false;
                    }
                },                stopPropagation:function() {
                    if(event.stopPropagation) {
                        event.stopPropagation();
                    } else {
                        event.cancelBuddle = true;
                    }
                },                removehandler:function(element,type,handler) {
                    if(element.removeEventListenter) {
                        element.addEventListenter(type,handler,false);
                    } else if (element.detachEvent) {
                        element.detachEvent("on"+type,handler);
                    } else {
                        element["on"+type] = null;
                    }
                },                getCharCode: function(event) {
                    if(typeof event.charCode == "number") {
                        return event.charCode;
                    } else {
                        return event.keyCode;
                    }
                },                getClipboardText: function(event) {
                    var clipboardData = event.clipboardData || window.clipboardData;
                    return clipboardData.getData("text");
                },                setClipboardText: function(event,value) {
                    if(event.clipboardData) {
                        return event.clipboardData.setData("text/plain",value);
                    } else if(window.clipboardData){
                        return window.clipboardData.setData("text",value);
                    }
                }            }            var textarea = document.forms[0].elements["text"];
            var button = document.getElementById("button");            (function() {
                function tabForward(event) {
                    event = EventUtil.getEvent(event);
                    var target = EventUtil.getTarget(event);                    if(target.value.length == target.maxLength) {
                        var form = target.parentElement;                        for(var i=0,len = form.elements.length;i<len-1;i++) {
                            if(form.elements[i] == target) {
                                form.elements[i+1].focus();
                                return ;
                            }
                        }
                    }                }                var textTel1 = document.getElementById("txtTel1");
                var textTel2 = document.getElementById("txtTel2");
                var textTel3 = document.getElementById("txtTel3");
                var textTel4 = document.getElementById("txtTel4");                EventUtil.addhandler(textTel1,"keyup",tabForward);
                EventUtil.addhandler(textTel2,"keyup",tabForward);
                EventUtil.addhandler(textTel3,"keyup",tabForward);
                EventUtil.addhandler(textTel4,"keyup",tabForward);            })();
        }
    </script>
</head>
<body>
<form>
    <input type="text" name="tel1" id="txtTel1" maxlength="3" />
    <input type="text" name="tel2" id="txtTel2" maxlength="3" />
    <input type="text" name="tel3" id="txtTel3" maxlength="3" />
    <input type="text" name="tel4" id="txtTel4" maxlength="3" />
</form>
</body>
</html>
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