//set variables
	var totalImages = 4 	//must be 1 less than actual number - zero offset
	var number = 0
	var intervalID
	var currentNumber
	
	//preload the rollover images
		if (document.images) {
			img0 = new Image();
			img0.src = "../images/catopithecus.jpg";
			img1 = new Image();
			img1.src = "../images/proteopithecus.jpg";
			img2 = new Image();
			img2.src = "../images/parapithecus.jpg";
			img3 = new Image();
			img3.src = "../images/apidium.jpg";
			img4 = new Image();
			img4.src = "../images/aegyptopithecus.jpg";
		}

	function imgGetter(){
		number = Math.round(Math.random() * totalImages) 	//generate random number
		currentNumber = number
		document.mainImg.src = eval("img" + number +".src")
	}