var images = new Array(); images[0] = "images/trail1.jpg"; images[1] = "images/trail2.jpg"; images[2] = "images/trail3.jpg"; images[3] = "images/trail4.jpg"; function ShowImg() { var number = images.length; var increment = Math.floor(Math.random() * number); var strTemp =''; document.write(strTemp); } var rotate = 4000; var count = 0; function RotateImg(myImage){ myImage.src=images[count]; count++; if(count==images.length){count = 0;} setTimeout("RotateImg(myImage)",rotate); }