function getHeaderImage() {
	var theImages = new Array();
	theImages[0] = '/gfx/header/header01.jpg';
	theImages[1] = '/gfx/header/header02.jpg';
	theImages[2] = '/gfx/header/header03.jpg';
	theImages[3] = '/gfx/header/header04.jpg';
	theImages[4] = '/gfx/header/header05.jpg';
	theImages[5] = '/gfx/header/header06.jpg';
	theImages[6] = '/gfx/header/header07.jpg';
	theImages[7] = '/gfx/header/header08.jpg';
	theImages[8] = '/gfx/header/header09.jpg';
	theImages[9] = '/gfx/header/header10.jpg';
	theImages[10] = '/gfx/header/header11.jpg';
	theImages[11] = '/gfx/header/header12.jpg';
	theImages[12] = '/gfx/header/header13.jpg';
	
	var j = 0;
	var p = theImages.length;
	var preBuffer = new Array();

	for (i = 0; i < p; i++){
	   preBuffer[i] = new Image();
	   preBuffer[i].src = theImages[i];
	}

	var whichImage = Math.round(Math.random()*(p-1));
	document.getElementById('headerImage').src = theImages[whichImage];
}