[HTML] pobierz, plaintext 
<form action='index.php' method=post>
test<input id="1" type="text" name="pole1" onchange="test(this.id, this.type, this.value)">
</form>
 
<script language='javascript'>
function test(id, type, value)
{
if(document.getElementById(id).value=='xxx')
{
 
  document.write("Bląd").getElementById(id).style.borderColor='red';
 
}
else
{
  document.getElementById(id).style.borderColor='green';
}
}
</script>
[HTML] pobierz, plaintext