[вегуд]

в любом случае, вот подправленный скрипт

<SCRIPT type=text/javascript>
<!-- 
  function count () {
    // Стоимости
    var id01cost = 3.30;
 var id02cost = 2.80;
 var id03cost = 2.30;
 var id04cost = 2.00;
 var id05cost = 6.60;
 var id06cost = 5.60;
 var id07cost = 4.60;
 var id08cost = 4.00;
 var id09cost = 1.00;
 var id10cost = 0.80;
 var id11cost = 0.65;
 var id12cost = 0.50;
 var id13cost = 2.00;
 var id14cost = 1.60;
 var id15cost = 1.30;
 var id16cost = 1.00;
 var id17cost = 4.30;
 var id18cost = 3.60;
 var id19cost = 2.95;
 var id20cost = 2.50;
 

    // Введённые значения
 var form = (document.getElementById('form1'));
 var id01 = form['id01'].value;
 var id02 = form['id02'].value;
 var id03 = form['id03'].value;
 var id04 = form['id04'].value;
 var id05 = form['id05'].value;
 var id06 = form['id06'].value;
 var id07 = form['id07'].value;
 var id08 = form['id08'].value;
 var id09 = form['id09'].value;
 var id10 = form['id10'].value;
 var id11 = form['id11'].value;
 var id12 = form['id12'].value;
 var id13 = form['id13'].value;
 var id14 = form['id14'].value;
 var id15 = form['id15'].value;
 var id16 = form['id16'].value;
 var id17 = form['id17'].value;
 var id18 = form['id18'].value;
 var id19 = form['id19'].value;
 var id20 = form['id20'].value;

    // Подсчёт
    id01total = id01*id01cost;
 id02total = id02*id02cost;
 id03total = id03*id03cost;
 id04total = id04*id04cost;
 id05total = id05*id05cost;
 id06total = id06*id06cost;
 id07total = id07*id07cost;
 id08total = id08*id08cost;
 id09total = id09*id09cost;
 id10total = id10*id10cost;
 id11total = id11*id11cost;
 id12total = id12*id12cost; 
 id13total = id13*id13cost;
 id14total = id14*id14cost;
 id15total = id15*id15cost;
 id16total = id16*id16cost; 
 id17total = id17*id17cost;
 id18total = id18*id18cost;
 id19total = id19*id19cost;
 id20total = id20*id20cost; 
 
 
    // Вывод
/*
    form['id01price'].value = id01total;
 form['id02price'].value = id02total;
 form['id03price'].value = id03total;
 form['id04price'].value = id04total;
 form['id05price'].value = id05total;
 form['id06price'].value = id06total;
 form['id07price'].value = id07total;
 form['id08price'].value = id08total;
 form['id09price'].value = id09total;
 form['id10price'].value = id10total;
 form['id11price'].value = id11total;
 form['id12price'].value = id12total;
 form['id13price'].value = id13total;
 form['id14price'].value = id14total;
 form['id15price'].value = id15total;
 form['id16price'].value = id16total;
 form['id17price'].value = id17total;
 form['id18price'].value = id18total;
 form['id19price'].value = id19total;
 form['id20price'].value = id20total;
*/ 
 
    // Общая сумма
    form['total'].value = id01total + id02total + id03total + id04total + id05total + id06total + id07total + id08total + id09total + id10total + id11total + id12total + id13total + id14total + id15total + id16total + id17total + id18total + id19total + id20total;
  }
-->
</SCRIPT>
<FORM name=form1 style="FONT: 11px tahoma" id="form1">
<table style="FONT: 11px tahoma" width="500">
<tr>
       <td><b>Исполнение</b></td>
       <td align="center">24...120</td>
       <td align="center">121...240</td>
       <td align="center">241...600</td>
       <td align="center">Более 600</td>
</tr>
<tr bgcolor="#F4F4F4">
       <td>Полноцветные односторонние</td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id01></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id02></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id03></td>
       <td align="center"><INPUT MAXLENGTH=4` size=4 name=id04></td>
</tr>
<tr>
       <td>Полноцветные двусторонние</td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id05></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id06></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id07></td>
       <td align="center"><INPUT MAXLENGTH=4 size=4 name=id08></td>
</tr>
<tr bgcolor="#F4F4F4">
       <td>Черно-белые односторонние</td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id09></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id10></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id11></td>
       <td align="center"><INPUT MAXLENGTH=4 size=4 name=id12></td>
</tr>
<tr>
       <td>Черно-белые двусторонние</td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id13></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id14></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id15></td>
       <td align="center"><INPUT MAXLENGTH=4 size=4 name=id16></td>
</tr>
<tr bgcolor="#F4F4F4">
       <td>Одна сторона полноцветная<br>Вторая черно-белая</td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id17></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id18></td>
       <td align="center"><INPUT MAXLENGTH=3 size=3 name=id19></td>
       <td align="center"><INPUT MAXLENGTH=4 size=4 name=id20></td>
</tr>
</table>
<table style="FONT: 11px tahoma" width="500">
<tr>
      <td><b>Общая стоимость:</b> <INPUT size=17 style="height: 20px; font: 11px tahoma" value="Общая стоимость" name=total>&nbsp;<INPUT style="font: 11px tahoma" onclick=count(); type=button value=Посчитать>&nbsp;<INPUT style="font: 11px tahoma" type=RESET value=Сбросить></td>
</tr>
</table>
</form>

поскольку полей для вывода промежуточных сумм (id01price, id02price...) просто нет на странице, я участок кода который их выводит закомментировал

приведенный скрипт по сути своей уебищный
если так действительно советуют делать в учебнике - поменяй его