bgPix = new Array("images/header01.jpg","images/header02.jpg","images/header03.jpg","images/header04.jpg")
imgCt = bgPix.length

function choosePic() {
	if (document.images) {
		randomNum = Math.floor((Math.random() * imgCt))
		document.headerPic.src = bgPix[randomNum]
	}
}