var valor
function gateway(){
var RotaBanner = new Array()

RotaBanner[0] = '<img src="imgs/foto_faro.jpg" width="220" height="177">'
RotaBanner[1] = '<img src="imgs/foto_playa.jpg" width="220" height="177">'
RotaBanner[2] = '<img src="imgs/foto_isla.jpg" width="220" height="177">'
RotaBanner[3] = '<img src="imgs/foto_roquedal.jpg" width="220" height="177">'
RotaBanner[4] = RotaBanner[0]
valor = Math.round(Math.random() * 4)
return RotaBanner[valor]
}