gazman,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<form>
<input type="text" id="text" />
<input type="submit" id="submit" onclick="return search()" />
</form>
<table>
<tr>
<td>s4567</td>
<td>9876</td>
<td>описание1</td>
<td>продукт1</td>
</tr>
<tr>
<td>s4568</td>
<td>9877</td>
<td>описание2</td>
<td>продукт2</td>
</tr>
<tr>
<td>s4569</td>
<td>9878</td>
<td>описание3</td>
<td>продукт3</td>
</tr>
<tr>
<td>s4570</td>
<td>9879</td>
<td>описание4</td>
<td>продукт4</td>
</tr>
<tr>
<td>s4571</td>
<td>9880</td>
<td>описание5</td>
<td>продукт5</td>
</tr>
<tr>
<td>s4572</td>
<td>9881</td>
<td>описание6</td>
<td>продукт6</td>
</tr>
</table>
<script>
function search() {
var txt = document.getElementById("text").value;
if (txt) {
var tags = document.getElementsByTagName("td");
for (i = 0; i < tags.length; i++)
if (tags[i].innerHTML == txt) tags[i].style.border = "#00FF00 solid 1px"
} else alert("Введено пустое значение");
return false
};
</script>
</body>
</html>