var images;

function cacheImgs() //preloading images on load
{
	images = new Array(3);
	
	for(var i = 0; i < images.length; i++)
	{
		images[i] = new Image(440, 335)
	}
	images[0] = "5.jpg";
	images[1] = "7.jpg";
	images[2] = "4.jpg";


}
function changeImg(imgNum)
{
	document.image.src = "img/" + images[imgNum];
}