Código HTML:
<html>
<body>
<script>
function multiplicar(){
m1 = document.getElementById("superficie").value;
tot= (m1+2)*85;
if (document.Myform.factor1.checked){
m2 = document.getElementById("factor1").value;
tot=tot*m2
}
if (document.Myform.factor2.checked){
m2 = document.getElementById("factor2").value;
tot=tot*m2
}
if (document.Myform.factor3.checked){
m2 = document.getElementById("factor3").value;
tot=tot*m2}
if (document.Myform.factor4.checked){
m2 = document.getElementById("factor4").value;
tot=tot*m2}
if (document.Myform.factor5.checked){
m2 = document.getElementById("factor5").value;
tot=tot*m2
}
document.getElementById("resultado").value = tot;
}
</script>
<form method="post" name="Myform" id="multiplicar" onsubmit="multiplicar();">
<table width="99%" border="0" cellspacing="0" cellpadding="3">
<tr>
<td width="11%" align="left"> </td>
<td width="35%" align="left">Factor geográfico:</td>
<td colspan="2" align="left" valign="middle" class="texto"><table width="81%" border="0" cellspacing="3" cellpadding="0">
<tr>
<td><input name="factor1" type="radio" value="1" id="factor1">
1</td>
<td><input name="factor2" type="radio" value="2" id="factor2">
2</td>
<td><input name="factor3" type="radio" value="3" id="factor3">
3</td>
<td><input name="factor4" type="radio" value="4" id="factor4">
4</td>
<td><input name="factor5" type="radio" value="5" id="factor5">
5</td>
</tr>
</table></td>
</tr>
<tr>
<td align="left"> </td>
<td align="left">Superficie de la estancia: </td>
<td width="39%" align="left"><input name="superficie" type="text" class="texto" id="superficie" >
m2</td>
<td width="15%" colspan="-3" rowspan="2" align="left"> </td>
</tr>
<tr>
<td align="left"> </td>
<td align="left">Tipo de estancia: </td>
<td align="left"><table width="60%" border="0" cellspacing="3" cellpadding="0">
<tr>
<td width="30%"><input name="estancia" type="radio" value="salon"></td>
<td width="70%">Salón</td>
</tr>
<tr>
<td><input name="estancia" type="radio" value="dormitorio"></td>
<td>Dormitorio</td>
</tr>
<tr>
<td><input name="estancia" type="radio" value="cocina"></td>
<td>Cocina</td>
</tr>
<tr>
<td><input name="estancia" type="radio" value="baño"></td>
<td>Baño</td>
</tr>
<tr>
<td><input name="estancia" type="radio" value="pasillo"></td>
<td>Pasillo</td>
</tr>
</table></td>
</tr>
<tr>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"> </td>
<td colspan="-3" align="left"> </td>
</tr>
<tr>
<td align="left"> </td>
<td align="left"> </td>
<td align="left"><input name="resultado" type="text" id="resultado"></td>
<td colspan="-3" align="left"><input type="button" name="Submit" value="Calcular" onclick="multiplicar();" ></td>
</tr>
</table> no es la mas apropiada.......pero ahi te hize una muestra, trata de ver otras opciones esta la hize muy apurado.....toy en el trabajo
