var thePics = new Array()

thePics[1] = "2/img_1.jpg"
thePics[2] = "2/img_2.jpg"
thePics[3] = "2/img_3.jpg"
thePics[4] = "2/img_4.jpg"
thePics[5] = "2/img_5.jpg"
thePics[6] = "2/img_6.jpg"
thePics[7] = "2/img_7.jpg"

var rn = Math.floor(Math.random() * thePics.length)
if (rn == 0) {
  rn = 1
}
document.write("<img src='"+thePics[rn]+"' alt='Natural Disaster Images' border=0>")