function changeURLPar(url, ref, value) {
	value=encodeURI(value);
	var str = "";
	if (url.indexOf('?') != -1)
		str = url.substr(url.indexOf('?') + 1);
	else
		return url + "?" + ref + "=" + value;
	var returnurl = "";
	var setparam = "";
	var arr;
	var modify = "0";
	if (str.indexOf('&') != -1) {
		arr = str.split('&');
		for (i in arr) {
			if (arr[i].split('=')[0] == ref) {
				setparam = value;
				modify = "1";
			} else {
				setparam = arr[i].split('=')[1];
			}
			returnurl = returnurl + arr[i].split('=')[0] + "=" + setparam + "&";
		}
		returnurl = returnurl.substr(0, returnurl.length - 1);
		if (modify == "0")
			if (returnurl == str)
				returnurl = returnurl + "&" + ref + "=" + value;
	} else {
		if (str.indexOf('=') != -1) {
			arr = str.split('=');
			if (arr[0] == ref) {
				setparam = value;
				modify = "1";
			} else {
				setparam = arr[1];
			}
			returnurl = arr[0] + "=" + setparam;
			if (modify == "0")
				if (returnurl == str)
					returnurl = returnurl + "&" + ref + "=" + value;
		} else
			returnurl = ref + "=" + value;
	}
	return url.substr(0, url.indexOf('?')) + "?" + returnurl;
}

function tab(lis,divs,more,callback)
{
	$(lis).hover(function(){
		$(this).addClass("active").siblings().removeClass("active");	
		$(divs).hide().eq($(lis).index(this)).show();
		if (more)
			$(more).find(".more").attr("href",$(this).attr("rel"));
		if (callback)
		{
			callback($(this));
		}
		return false;
	});
}