Вот:
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script type="text/javascript">
var base = { 1 : {src : "images/picture1.jpg", price : 5900}, 2 : {src : "images/picture2.jpg", price : 6900}, 3 : {src : "images/picture2.jpg", price : 7900}};
function changeImage(form) {
document.images["pic"].src = base[form.value].src;
document.getElementById("mydiv").innerHTML = base[form.value].price;
form.value = 0
};
function calc() {
var type_widht = document.getElementById("type_widht");
var type_height = document.getElementById("type_height");
var type_area = document.getElementById("type_area");
var type_money = document.getElementById("type_money");
var type_mydiv = document.getElementById("mydiv");
var result = document.getElementById("result_widht");
var result = document.getElementById("result_height");
var result = document.getElementById("result_area");
var result = document.getElementById("result_money");
var result = document.getElementById("result");
var price_widht = 0;
var price_height = 0;
var price_area = 0;
var price_money = 0;
var pricex = 0;
price_widht += parseInt(type_widht.value);
price_height += parseInt(type_height.value);
price_area += parseInt(type_widht.value*type_height.value)/1000000;
price_money += parseInt(type_widht.value*type_height.value*type_mydiv.value)/1000;
pricex = price_area;
result_area.innerHTML = price_area;
result_money.innerHTML = price_money;
result.innerHTML = pricex;
};
</script>
</head>
<body>
<form>
<table>
<tr>
<td width="200"></td>
<td><img name="pic" src="images/picture1.jpg" alt=""></td>
</tr>
<tr>
<td width="200">Укажите Параметр:</td>
<td width="200"><select size=1 name="imagename" onChange="changeImage(this)" id="price">
<option value="0">Выбрать</option>
<option value="1">Параметр 1</option>
<option value="2">Параметр 2</option>
<option value="3">Параметр 3</option>
</select>
</td>
<td width="200"><span id="mydiv">0</span> Ед.изм.</td>
</tr>
<tr>
<td width="200"></td>
</tr>
</table>
</form>
<table>
<tr>
<td width="200">Укажите значение widht:</td>
<td width="100"><input type="text" id="type_widht" value="0" onchange="calc()" /></td>
<td width="200">Результат деления на миллион:<span id="result_area">0</span> Ед.изм.</td>
</tr>
<tr>
<td width="200">Укажите значение height:</td>
<td width="100"><input type="text" id="type_height" value="0" onchange="calc()" /></td>
<td width="200">Результат деления на тысячу:<span id="result_money">0</span> Ед.изм.</td>
</tr>
<tr style="background-color:#eeeeee;border:1px solid #c6c6c6">
<td width="200" class="td_result">ИТОГО:</td>
<td width="100"></td>
<td class="td_result"><span id="result">0</span> Ед.изм.</td>
</tr>
</table>
</body>
</html>