var image = "images/";

var imgMap = new Array();
imgMap[1] = "IrondaleDrilling.jpg";
imgMap[2] = "Subway.jpg";
imgMap[3] = "DSCI0005.jpg";
imgMap[4] = "SECorner.jpg";
imgMap[5] = "SBSouthwest.jpg";
imgMap[6] = "NStrench.jpg";
imgMap[7] = "DSCI0007.jpg";

var captions = new Array();
captions[1] = "Irondale Drilling";
captions[2] = "Subway";
captions[3] = "Emerson Residence Hall";
captions[4] = "Campus Store";
captions[5] = "Science Building";
captions[6] = "Campus telecommunciations ductbank";
captions[7] = "Gwinn Commons";

var rand = 1;

function pickImage() {
  rand = (new Date).getTime() / 1000;
  rand = Math.floor(((rand - Math.floor(rand)) * (captions.length-1)) + 1);
  image += imgMap[rand]
}