куда проще:
<script type="text/javascript">
window.onload = function() {
var events = ['keyup', 'change'], i = events.length, input = document.getElementById('input');
while(i--) {
input['on'+events[i]] = function() {
var _value = this.value;
if(_value != '' && /\d/.test(_value)) {
alert('пользовател'+(_value == 1 ? 'ь' : _value >= 2 && _value <= 4 ? 'я' : 'ей'));
}
};
break;
}
};
</script>
<input type="text" id="input" value="" />
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