var time

function FirstImage() {
  if (document.images) {
        clearTimeout(time)
        document.banner.src="images/real_estate_screenshot1.gif";
        time=setTimeout("SecondImage()",3500);
      }
}


function SecondImage() {
  if (document.images) {
        clearTimeout(time)
        document.banner.src="images/real_estate_screenshot2.gif";
        time=setTimeout("ThirdImage()",3500);
      }
}

function ThirdImage() {
  if (document.images) {
        clearTimeout(time)
        document.banner.src="images/real_estate_screenshot3.gif";
        time=setTimeout("FourthImage()",3500);
      }
}
function FourthImage() {
  if (document.images) {
        clearTimeout(time)
        document.banner.src="images/real_estate_screenshot4.gif";
        time=setTimeout("FirstImage()",3500);
      }
}