function firstItemOn(j) {
//of all item objects, set first one to white on state
var firstItem = document.getElementById("item" + j);
firstItem.style.visibility = "visible";
}

function swapContent(n) {
//alert("item"+n);
var theImage = document.getElementById("mainimage");
//var thisItemNumber = document.getElementById("item"+n);
//alert (thisItemNumber);
for (var i=0; i<8; i++) {
	if (i != n) {
		document.getElementById("item" + i).style.visibility="hidden";
		document.getElementById("thumb" + i).className="thumb";
		}
	else {
		//m = "s" + n;
		//alert (n);
		theImage.style.backgroundImage = 'url(images/thumbs/id/' + n + '-0-id.gif)';
		document.getElementById("item" + i).style.visibility="visible";
		document.getElementById("thumb" + i).className="thumb_on";
		}
	}
}


function swapSub(k) {
//alert(k);
var imageSub = document.getElementById("mainimage");
var blockNumber = document.getElementById("thumbnumber" + k);


		imageSub.style.backgroundImage = 'url(images/thumbs/id/' + k + '-id.gif)';
		blockNumber.className="number_block_on";


}