// The page's url should be in the format "/artwork/23/",
	// or "/artwork/?imageID=23"


	function getPrevArtwork(){
		var id = getID();
		//alert(id);
		if(id > 1){
			window.location = "/artwork/" + (id - 1);
		}
	}

	function getNextArtwork(){
		var id = getID();
		//alert(id);
		window.location = "/artwork/" + (Number(id) + 1);
	}

	function getID(url){

		var url = window.location.href;

		if(getIDType(url) == "first"){
			return 1;
		} else if(getIDType(url) == "hashes"){
			return getIDFromPath(url);
		} else if (getIDType(url) == "query"){
			return getIDFromQuery(url);
		}
	}

	function getIDType(str){
		if(str.indexOf("?imageID") != -1){
			//alert("query");
			return "query";
		} else if(str.match(/\/[0-9]{1,3}\//)){
			//alert("hashes");
			return "hashes";
		} else if (str.match(/\/artwork\/$/)){
			//alert("first");
			return "first";
		}

		return "";
	}

	function getIDFromQuery(url){
		var n = url.indexOf("imageID=");
		return url.substr(n+8);

	}

	function getIDFromPath(url){
		var a = url.split("/");
		return a[a.length - 2];
	}