function refreshFB() {
	var ns4up = (document.layers) ? 1 : 0;  // browser sniffer
	if (ns4up) {
		loadFB();
	}
}

function loadFB(){
	showFunBlocks('img_funblock');
}

function showFunBlocks(pImg) {	
	
	blocks = new Array;
	blocks[1] = new Image();
	blocks[1].src = "assets/view_tube.gif";
	blocks[2] = new Image();
	blocks[2].src = "assets/chimneyclimber_layers.gif";
	blocks[3] = new Image();
	blocks[3].src = "assets/chain_walk.gif";
	blocks[4] = new Image();
	blocks[4].src = "assets/pb_sliding_01_fin.gif";
	blocks[5] = new Image();
	blocks[5].src = "assets/pb_rollplay_01_fin.gif";
	blocks[6] = new Image();
	blocks[6].src = "assets/ps_jumping_01_fin.gif";
	blocks[7] = new Image();
	blocks[7].src = "assets/pb_hanging_01_fin.gif";
	blocks[8] = new Image();
	blocks[8].src = "assets/pb_digging_01_fin.gif";
	blocks[9] = new Image();
	blocks[9].src = "assets/pb_climbing_01_fin.gif";
	
	var imgnum = blocks.length - 1;
	var useRand=0;
	do {
		var randnum = Math.random();
		rand1 = Math.round((imgnum - 1) * randnum) + 1;
	} while (rand1 == useRand);
	useRand = rand1;
	document.images[pImg].src = blocks[useRand].src;
	
}