strsin,
вместо id должен быть class
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
td{
border: solid 3px rgb(128, 0, 128);
background-color: rgb(255, 255, 0);
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(function() {
$("tr").each(function() {
"Viktor Pupkin" == $("#nm", this).text() && $("#fhrpr", this).text(function(b, a) {
5 <= +a && $(this).css({
"background-color": "Blue",
color : "rgb(255, 255, 255)"
})
})
})
});
</script>
</head>
<body>
<table width="400" summary="" >
<thead>
<tr>
<th>name</th>
<th>num</th>
</tr>
</thead>
<tbody> <tr>
<td id = "nm">Viktor Pupkin</td>
<td id = "fhrpr">5</td>
</tr>
<tr>
<td id = "nm">Viktor Pupkin</td>
<td id = "fhrpr">1</td>
</tr>
<tr>
<td id = "nm">Viktor Pupkin</td>
<td id = "fhrpr">5</td>
</tr>
</tbody>
</table>
</body>
</html>