k3b3, ам )))
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta http-equiv="content-type" content="text/html; charset=windows-1251" />
</head>
<body>
<form name="Ceny" action="" method="post" style="margin-left:auto; margin-right:auto">
<table style="border: 2px solid #CCC; background:#3e3e3e">
<tr>
<td class="text">СВЕДЕНИЕ:</td>
<td >
<select onchange="itogo()" name="Svedenie" style="width: 200px; color:#9a9a9a; background:#3e3e3e;">
<option value="Yes" >Да</option>
<option value="No" selected="selected">Нет</option>
</select>
</td>
</tr>
<tr>
<td class="text">Количество дорожек wav:</td>
<td>
<select onchange="itogo()" name="KolvoDorogi" style="width: 200px; color:#9a9a9a; background:#3e3e3e;">
<option value="1" selected="selected">до 10-ти шт.</option>
<option value="2">от 10 до 13 шт.</option>
<option value="3">от 13 до 16 шт.</option>
<option value="4">от 16 до 19 шт.</option>
<option value="5">от 19 до 22 шт.</option>
<option value="6">от 22 до 25 шт.</option>
<option value="7">от 25 до 28 шт.</option>
<option value="8">от 28 до 31 шт.</option>
</select></td>
</tr>
<tr>
<td class="text">МАСТЕРИНГ:</td>
<td>
<select onchange="itogo()" name="Mastering" style="width: 200px; color:#9a9a9a; background:#3e3e3e;">
<option value="Yes" >Да</option>
<option value="No" selected="selected">Нет</option>
</select>
</td>
</tr>
<tr>
<td class="text">Количество минут:</td>
<td><select onchange="itogo()" name="MasteringChange" style="width: 200px; color:#9a9a9a; background:#3e3e3e;">
<option value="1" selected="selected">До 5 минут</option>
<option value="2">От 5 до 10 минут</option>
<option value="3">От 10 до 15 минут</option>
<option value="4">От 15 до 20 минут</option>
<option value="5">От 20 до 25 минут</option>
<option value="6">От 25 до 30 минут</option>
</select></td>
</tr>
<tr >
<th class="stylered" align="left">ИТОГО (руб.):</th>
<td><input name="TarifTotal" type="text" class="styleredbig" style="width: 200px; color:#9a9a9a; background:#3e3e3e;" />
<input type="hidden" name="txtorder" />
</td>
</tr>
</table>
</form>
<script>
function itogo()
{
var SvedenieValue = (document.Ceny.Svedenie.value == 'Yes');
document.Ceny.KolvoDorogi.disabled = !SvedenieValue;
var KolvoDorogiValue = +document.Ceny.KolvoDorogi.value;
var svedenieitogo = SvedenieValue? [0,300,390,480,570,660,750,840,930][KolvoDorogiValue]:0;
var MasteringValue = (document.Ceny.Mastering.value == 'Yes')
document.Ceny.MasteringChange.disabled = !MasteringValue;
var MasteringChangevalue = +document.Ceny.MasteringChange.value;
var masteringitogo = MasteringValue? [0,200,400,600,800,1000,1200][MasteringChangevalue]:0;
document.Ceny.TarifTotal.value = svedenieitogo + masteringitogo
}
window.onload = function () {
itogo()
}
</script>
</body>
</html>