//Define your images using arbitrary variables, to be passed in as arguments later down the page:
var mapa = '<img src="mapa_big.jpg" width="981" height="630" border="0" alt="Mapa">'
var rent1 = '<img src="rent1.jpg" width="800" height="600" border="0" alt="Foto">'
var rent2 = '<img src="rent2.jpg" width="800" height="600" border="0" alt="Foto">'
var rent3 = '<img src="rent3.jpg" width="800" height="600" border="0" alt="Foto">'