img1 = new Image(378,245);
img1.src = "img/portada/margarita";
img2 = new Image(378,245);
img2.src = "img/portada/sabina";
img3 = new Image(378,245);
img3.src = "img/portada/pinell";
img4 = new Image(378,245);
img4.src = "img/portada/ocean";
img5 = new Image(378,245);
img5.src = "img/portada/canada.jpg";

function apartament(tipus)
{
 switch (tipus)
 {
   case 2:
     document.apt.src = img2.src;    
     break;

   case 3:
     document.apt.src = img3.src;
     break;

   case 4:
     document.apt.src = img4.src;
     break;

   case 5:
     document.apt.src = img5.src;
     break;

   default:
     document.apt.src = img1.src;
 }
}