var tour = 0;

function rotate_pictures() {

   var tourimage=new Array(10);
      tourimage[0]='images/montague1.jpg';
      tourimage[1]='images/montague2.jpg';
      tourimage[2]='images/montague3.jpg';
      tourimage[3]='images/montague4.jpg';
      tourimage[4]='images/montague6.jpg';
      tourimage[5]='images/montague1.jpg';
      tourimage[6]='images/montague2.jpg';
      tourimage[7]='images/montague3.jpg';
      tourimage[8]='images/montague4.jpg';
      tourimage[9]='images/montague6.jpg';


   var tourtitle=new Array(10);
      tourtitle[0]='Entrance';
      tourtitle[1]='Bar Area';
      tourtitle[2]='Dining Area';
      tourtitle[3]='Pool Area';
      tourtitle[4]='Patio Area';
      tourtitle[5]='Entrance';
      tourtitle[6]='Bar Area';
      tourtitle[7]='Dining Area';
      tourtitle[8]='Pool Area';
      tourtitle[9]='Patio Area';

   if (tour < tourimage.length/2-1) {tour = tour + 1} else {tour = 0}
   document.images['pic1'].src = tourimage[tour];
   document.images['pic2'].src = tourimage[tour+1];
   document.images['pic3'].src = tourimage[tour+2];
   document.images['pic4'].src = tourimage[tour+3];
   document.images['pic5'].src = tourimage[tour+4];
   document.getElementById('pictitle').innerHTML = tourtitle[tour];
 
}