var image_list = new Array(
"images/56/A1.jpg",			
"images/56/A5.jpg",			
"images/56/AABIRD.jpg",			
"images/56/bug.jpg",			
"images/56/c18.jpg",			
"images/56/frogsplit.jpg",
"images/56/j7.jpg",			
"images/56/owl.jpg",			
"images/56/panther.jpg",			
"images/56/seaturtle.jpg",			
"images/56/yellowforest.jpg",			
"images/56/Aurora.jpg",			
"images/56/Butterfly3.jpg",			
"images/56/u10.jpg",			
"images/56/APufferfromMagicSea.jpg"
);

function print_image_only() {
	document.write('<img style="border: 2px solid #FFFFFF" src="' + image_list[nextRandom()] + '" alt="" width="90" height="56">');
}

function print_image_and_description() {
	var i = nextRandom();
	document.write('<a href="' +url_list[i]+ '" onClick="return checkregistered()">');
	document.write('<img border="2" src="' +image_list[i]+ '" alt="" width="90" height="56"><br>');
	document.write('<font face="arial, helvetica" size="2"><b>' +description_list[i]+ '</b></font></a>');
}

var selected_images = "|";

function nextRandom() {
	var n = Math.floor(Math.random()*image_list.length);
	var cnt = 0;
	
	while(selected_images.indexOf("|"+n+"|") != -1  && ++cnt < 100) {
		n = Math.floor(Math.random()*image_list.length);
	}
	
	selected_images += n + "|";
	return n;
}