function ranImg() {
	imgURL = new Array(); 
	imgURL[0] = "img/bnr/img00.jpg"; 
	imgURL[1] = "img/bnr/img01.jpg"; 
	imgURL[2] = "img/bnr/img02.jpg";
	imgURL[3] = "img/bnr/img03.jpg"; 

	n = Math.floor(Math.random()*4);
	document.write("<img src='"+imgURL[n]+"' width='569' height='221' alt='' />"); 
}