function changeImage() {
  slide++;

  if(slide >= slides.length) {
    slide = 0;
  }

  document.getElementById('slideShowImg').src = slides[slide].src;
}

function slideShow(pics) {
  filepath = 'http://www.bizport.biz//images/uploads/';
  slides = new Array;

  for(i = 0; i < pics.length; i++) {
    slides[i] = new Image;
    slides[i].src = filepath + pics[i];
  }

  slide = 0;

  document.write('<div id="slideShow">');
  document.write('<p><img id="slideShowImg" src="' + slides[slide].src + '" alt="Sign &amp; Graphics" /></p>');
  document.write('</div>');

  setInterval("changeImage()", 3000);
}