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Ето ти и едно просто примерче (ако съм те разбрал)onClick="document.getElementById('полето').style.fontWeight = "bold";
<p id="test">Vivamus suscipit interdum dolor nec ultrices. Nullam ut sagittis eros. Aliquam erat volutpat. Vivamus cursus tellus ac magna interdum vel scelerisque lorem imperdiet. Donec quis ligula dui, congue scelerisque dui. Duis volutpat blandit lorem eget molestie. Cras auctor faucibus gravida. Quisque mattis enim a quam luctus dictum. Donec volutpat pellentesque mauris at commodo. Maecenas rhoncus gravida sagittis. </p><br />
<p style="font-weight:bold;text-decoration:underline;" onClick="document.getElementById('test').style.fontWeight = 'bold';">B</p>
ще го направишdocument.getElementById('test').style.fontWeight = 'bold'
мисля ,че така трябва да стане.var texts = document.getElementById('test');
texts.value = '' + texts.value + '';