img = new Array();
img[0] = "image/headerimage_1.jpg";
img[1] = "image/headerimage_2.jpg";
img[2] = "image/headerimage_3.jpg";
img[3] = "image/headerimage_4.jpg";
img[4] = "image/headerimage_5.jpg";
img[5] = "image/headerimage_6.jpg";

function setImg(){
	amount = img.length;
	No = Math.floor(Math.random()*amount);
	document.write("<img src='" + img[No] + "' border='0' width='948' height='287'> ");
}