<!DOCTYPE HTML>
<html>
<head> </head>
<body>
<table>
<tbody>
<tr>
<td id="test" width="82" style="border-width: 0.5pt 0.5pt 0.5pt 0px; border-style: solid solid solid none;">Размер 0.5pt не соответствует</td>
</tr>
</tbody>
</table>
<script>
var test = document.getElementById('test');
alert( test.style.borderWidth.replace(/0\.5pt/g, '1px') );
</script>
</body>
</html>