Dúvida Simples

Olá pessoal tudo blz? É o seguinte: tenho esse pequeno formulário de compra de uma cama que tem seus items que podem ser habilitados e desabilitados coisa e tal. Só que não consigo somar os items selecionados corretamente. Por exemplo: 100+100=100100 está saindo assim e não 200. Será que alguém poderia me dizer aonde está o erro ou se está faltando alguma coisa.
Obrigado.

<html>
<head><title>Trabalho de Interface Home máquina</title>
<script language="JavaScript">
function mudaPreco()
{
  document.cadCompra.precocabe.value="R$"+document.cadCompra.material.value;
}
function cabec()
{
   if (document.cadCompra.cabeceira.checked==true)
  {
   document.cadCompra.material.disabled = false;
  }
   else
  {
   document.cadCompra.material.disabled = true;
  }
}
function extras()
{
   if (document.cadCompra.edredon.checked==true)
  {
   document.cadCompra.edremodel.disabled = false;
  }
   else
  {
   document.cadCompra.edremodel.disabled = true;
  }
}
function extras2()
{
   if (document.cadCompra.jogocama.checked==true)
  {
   document.cadCompra.jogcama.disabled = false;
  }
   else
  {
   document.cadCompra.jogcama.disabled = true;
  }
}
function somaPrecos()
{
  var i,total,mat,edre,jog;
       for (i=0; i<document.cadCompra.cama.length; i++)
      {
         if (document.cadCompra.cama[i].checked)
        {
  total=document.cadCompra.cama[i].value;
  break;
        }
	
      }
         mat=document.cadCompra.material.value;
         edre=document.cadCompra.edremodel.value;
  jog=document.cadCompra.jogcama.value;
  eval(total=total+mat+edre+jog);
         document.cadCompra.somatotal.value=total;
}
</script>
</head>
<body bgcolor="" onLoad="document.cadCompra.nome.focus()">
<form method="post" name="cadCompra">
<p>Escolha do Modelo:<br>
<br>
<input type="radio" name="cama" value="1000" checked>&nbsp;&nbsp;Solteiro - R$1.000,00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<input type="checkbox" name="cabeceira" onClick="cabec()">Cabeceira<br>
<input type="radio" name="cama" value="1500">&nbsp;&nbsp;Casal - R$1.500,00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<select name="material" disabled onChange="mudaPreco()">
<option value="">Material
<option value="200">Branco
<option value="400">Mogno
<option value="600">Cerejeira
</select><br>
<input type="radio" name="cama" value="2000">&nbsp;&nbsp;Queen size - R$2.000,00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<input type="text" name="precocabe" value="" size="10" disabled style="height: 20"><br>
<input type="radio" name="cama" value="2500">&nbsp;&nbsp;King size - R$2.500,00<br><br>
EXTRAS
<br><br>
<input type="checkbox" name="edredon" onClick="extras()">Edredon&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<select name="edremodel" disabled>
<option value="">Opções...
<option value="100">Solteiro   - R$100,00
<option value="150">Casal      - R$150,00
<option value="200">Queen size - R$200,00
<option value="250">King size  - R$250,00
</select>&nbsp;
Total:&nbsp;<input type="button" onClick="somaPrecos()" name="total" value="Calcular" size="4"><input type="text" disabled name="somatotal" value="" size="4" parseInt="somaprecos + somatotal"><br>
<input type="checkbox" name="jogocama" onClick="extras2()">Jogo de Cama&nbsp;&nbsp;&nbsp;
<select name="jogcama" disabled>
<option value="">Opções...
<option value="100">Solteiro   - R$50,00
<option value="150">Casal      - R$100,00
<option value="200">Queen size - R$150,00
<option value="250">King size  - R$200,00
</select>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<input type="submit" value="Enviar" onClick="clicar()" name="send">
<input type="reset" value="Limpar" name="clear">
</form>
</body>
</html>

#1 Vitor Gomes

#2 Paulo Freitas

#3 Vitor Gomes

#4 Paulo Freitas

#5 Klaus

#6 Vitor Gomes

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