jQuery.noConflict();
jQuery(document).ready(function(){
// Function that return a number between 0 and "nums - 1"
function getRandom(nums) {
  var ranNum= Math.round(Math.random()*nums);
  return ranNum;
}
  // Tells us how many images we have available.
  var numberOfImages = 4;
  var randomNumber = getRandom(numberOfImages);
  // Create an array to hold the names of all images.
  var image = new Array(numberOfImages);
  image[0]="images/home/leadgen_bi_mainbanner1.jpg";
  image[1]="images/home/leadgen_bi_mainbanner2.jpg";
  image[2]="images/home/leadgen_bi_mainbanner3.jpg";
  image[3]="images/home/leadgen_bi_mainbanner4.jpg";

  jQuery('#big-home-pic-bi').attr('src', image[randomNumber]);

});