var photos_1 = [
"fotos/631.jpg",
"fotos/630.jpg",
"fotos/3835.jpg",
"fotos/3837.jpg",
"fotos/3839.jpg"
 ]
var curpic = undefined
var cur_no = undefined

function select_photo_1(pic)
{
  curpic = pic
  
  if (cur_no == undefined) cur_no = 0
  pic.src = photos_1[cur_no]
  cur_no = cur_no +1
  if (cur_no > 4) cur_no = 0
}