var currentdate = 0
var core = 0


function StringArray (n) {
  this.length = n;
  for (var i =1; i <= n; i++) {
    this[i] = ' '

  }
}

image = new StringArray(6)
image[0] = 'images/sponsorads/antlers_sm.jpg'
image[1] = 'images/sponsorads/dawson_sm.jpg'
image[2] = 'images/sponsorads/geokinetics_sm.jpg'
image[3] = 'images/sponsorads/global_sm.jpg'
image[4] = 'images/sponsorads/hampsonrussell_sm.jpg'
image[5] = 'images/sponsorads/pgs_sm.jpg'
image[6] = 'images/sponsorads/tgc_sm.jpg'
image[7] = 'images/sponsorads/westerngeco2_sm.jpg'
image[8] = 'images/sponsorads/westerngeco3_sm.jpg'


var ran = 60/image.length


function ranimage() {
  currentdate = new Date()
  core = currentdate.getSeconds()
  core = Math.floor(core/ran)
    return(image[core])
}

document.write("<img width='165' height='90' border='0' vspace='5' alt='PBGS Sponsor' src='" +ranimage()+ "'>")