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и да трябва да имаш форм:type="submit"
<html>
<head>
<title></title>
</head>
<body>
<form method="post" action="index.html">
<input type="submit" value="emagi" onclick="this.disabled='disable'" />
</form>
</body>
</html>
<input name=\"addstr\" type=\"submit\" value=\"+\" onclick=\"this.disabled='disabled'\" />