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Checkbox и textarea

Lag

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Lag Explorer

Lag

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Хотел сделать так чтобы только полсе прокрутки содержимого в текст. поле можно было поставить флажок. Но как то не получилось, помогите найти ошибку. Заранее благодарен.

(P.S. onclick="f_click();" привязанно к другой функции и работает)

<!DOCTYPE HTML PUBLIC "-//W3C//DTD Html 4.01//EN"
"http://www.3.org//TR/html4/transitional.dtd.">
<html>
<head>
<title>Флажок</title>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
<script type="text/javascript">
<!--
function f_flag() {
document.getElementById(check1).disabled = false;
}

//-->
</script>
</head>
<body>
<center><h2>Пример использования событий</h2></center>
<form>
Текстовое поле:<br><br>
<textarea name="pole1"  id="pole1" rows="10" cols="50" 
readonly onscroll="f_flag();">
Текст
111111111
11111111
1
1
1
1
1
1
1
1
1
1
1
1
</textarea><br>

<input type="checkbox" name="check1" id="check1" onclick="f_click();" disabled>Принять<br>
</div>
</form>

</body>
</html>

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