function randInt(min,max)
{
     var div = (max - min) + 1
     var randNum = Math.random()
     for (var i = 0; i <= div - 1; i++)
     {
          if (randNum >= i / div && randNum < (i+1) / div)
          {return i + min}
     }
}


var abcd = randInt(1,5);

if (abcd == 1) {

     document.write("<img src=\"dig_img/banner0.jpg\" alt=\"banner0\" >")
}
if (abcd == 2) {
     document.write("<img src=\"dig_img/banner1.jpg\" alt=\"banner1\">")
}
 if (abcd == 3) {
     document.write("<img src=\"dig_img/banner2.jpg\" alt=\"banner2\">")
}
if (abcd == 4) {
     document.write("<img src=\"dig_img/banner3.jpg\" alt=\"banner3\">")
}
if (abcd == 5) {
     document.write("<img src=\"dig_img/banner4.jpg\" alt=\"banner4\">")
}