function getElementTop(elem)
{
	var el = elem;
	var t = el.offsetTop;

	while (el.offsetParent)
	{
		el = el.offsetParent;
		t += el.offsetTop;
	}

	return t;
}


			function addOption(sel, val, text, isSelected)
			{
						var opt = document.createElement("option");
						opt.text = text;
						opt.value = val;
						if (isSelected)
							opt.setAttribute("selected", "selected");
						try
						{
							sel.add(opt, null);
						}
						catch(ex)
						{
							sel.add(opt);
						}
			}

function AjaxRequest()
{
	this.requestHandler = function()
	{
	};

	this.doRequest = function(url)
	{
		  http_request = false;
		  if (window.XMLHttpRequest) { // Mozilla, Safari,...
			 http_request = new XMLHttpRequest();
			 if (http_request.overrideMimeType) {
				http_request.overrideMimeType("text/html");
			 }
		  } else if (window.ActiveXObject) { // IE
			 try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
			 } catch (e) {
				try {
				   http_request = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (e) {}
			 }
		  }
		  if (!http_request) {
			 alert("Cannot create XMLHTTP instance");
			 return false;
		  }
		  http_request.onreadystatechange = this.requestHandler;
		  http_request.open("GET", url, true);
		  http_request.send(null);
	};
}

function addCity(name)
{
	var r = new AjaxRequest();
	r.requestHandler = function()
	{
		if (http_request.readyState == 4)
		{
        	if (http_request.status == 200)
			{
	            result = http_request.responseText;
				if (result == "ERR_CITY_EXISTS")
					alert("Такой город уже есть в списке");
				else
				{

				document.getElementById("divNewCity").style.display = "none";
				var sel = document.getElementById("field_7");
				if (sel)
				{
					while (sel.length > 1)
						sel.remove(1);
					var els = result.split("~");
					for (var i = 0; i < els.length-1; i += 2)
						addOption(sel, els[i], els[i + 1], els[i] == name);
					loadBCList(sel.options[sel.selectedIndex].value, "~~");
					document.getElementById("field_8").value = "";
					var el = document.getElementById("bc_BCHumanName");
					if (el)
						el.value = "";
				}
				}
	        } else
			{
	        	alert("There was a problem with the request.");
	        }
    	}
	};

	r.doRequest("mods/bc.php?addcity=" + encodeURIComponent(name));
}

function addBC(name, address, metro, addFormSubmit)
{
	var r = new AjaxRequest();
	r.requestHandler = function()
	{
		if (http_request.readyState == 4)
		{
        	if (http_request.status == 200)
			{
	            result = http_request.responseText;

				document.getElementById("divNewBC").style.display = "none";
				loadBCList(document.getElementById("field_7").value, name + "~" + address + "~" + metro, addFormSubmit, document.getElementById("bc_search").value, document.getElementById("BCNameStart").value);
	        } else
			{
	        	alert("There was a problem with the request.");
	        }
    	}
	};

	var cs = document.getElementById("field_7");
	var s = "mods/bc.php?addbc=" + encodeURIComponent(name) + "&address=" + encodeURIComponent(address) + "&metro=" + encodeURIComponent(metro) + "&bccity=" + encodeURIComponent(cs.options[cs.selectedIndex].value) + "&hash=" + Math.random();
	r.doRequest(s);
}

function selectBCNameStart(start, addFormSubmit)
{
	document.getElementById("BCNameStart").value = start;
	loadBCList(document.getElementById("field_7").value, "", addFormSubmit, "", start);
}

function loadBCList(city_id, highlight_value, addFormSubmit, filter, start, force)
{
	var r = new AjaxRequest();
	r.requestHandler = function()
	{
		if (http_request.readyState == 4)
		{
        	if (http_request.status == 200)
			{
	            		result = http_request.responseText;
				var ld = document.getElementById("loadingDiv");
				if (ld)
					ld.parentNode.removeChild(ld);
				var sel = document.getElementById("field_8");
				var bcDiv = document.getElementById("bc_list");
				if (bcDiv)
				{
					var el = document.getElementById("bc_search");
					el.value = filter;
					el.onchange = function()
					{
						loadBCList(city_id, highlight_value, addFormSubmit, this.value, "");
					}
					if (result.indexOf("MSG:") == 0)
					{
						bcDiv.innerHTML = result.substr(4);
						return;
					}
					bcDiv.innerHTML = "";
					el = document.createElement("table");
					el.id = "bc_list_table";
					el.width = "100%";
					bcDiv.appendChild(el);
					var tbl = document.createElement("tbody");
					el.appendChild(tbl);
					var els = result.split("~");
					var hni = document.getElementById("bc_BCHumanName");
					var tbltr = document.createElement("tr");
					var tbltd;
					for (var i = 0; i < els.length-3; i += 4)
					{
						if ((i % 12 == 0 && i > 0))
						{
							tbl.appendChild(tbltr);
							tbltr = document.createElement("tr");
						}
						tbltd = document.createElement("td");
						tbltd.style.paddingTop = "5px";
						tbltd.style.width = "33%";
						if (els[i] + "~" + els[i+1] + "~" + els[i+2] == highlight_value)
						{
							tbltd.style.backgroundColor = "#DDDDFF";
							tbltd.id = "scrollHere";
						}
						tbltr.appendChild(tbltd);
						el = document.createElement("a");
						var code = "javascript: document.getElementById('field_8').value = '" + els[i] + "'+'~'+'" + els[i+1] + "'+'~'+'" + els[i+2] + "'; ";
						if (hni)
							code += " document.getElementById('bc_BCHumanName').value = '" + els[i] + " " + els[i+1] + " " + els[i+2] + "'; ";
						if (addFormSubmit == true)
							code += " document.forms[0].submit(); ";
						code += " void(0);";
						el.href = code;
						el.innerHTML = "<b>" + els[i] + "</b><br/>" + els[i+1];
						if (els[i+2] != "")
							el.innerHTML += " <img valign='middle' src='images/metro.gif' alt='' style='border:none; margin-right:2px;' />" + els[i+2];
						tbltd.appendChild(el);
						if (i >= els.length - 4)
							tbl.appendChild(tbltr);
					}
					var se = document.getElementById("scrollHere");
					if (se)
						window.scrollTo(0, getElementTop(se));
				}

	        } else
			{
	        	alert("There was a problem with the request.");
	        }
    	}
	};

	var ld = document.createElement("div");
	ld.style.backgroundColor = "white";
	ld.style.position = "absolute";
	ld.style.left = "50%";
	ld.style.top = "50%";
	//ld.innerHTML = '<img src="images/loading.gif" alt="" /><br/>Загрузка...';
	ld.id = "loadingDiv";
	document.forms[0].appendChild(ld);

	//alert("mods/bc.php?city=" + (city_id) + "&hash=" + Math.random() + "&filter=" + (filter));
	if (!filter)
		filter = "";
	var req_str = "mods/bc.php?city=" + encodeURIComponent(city_id) + "&hash=" + Math.random() + "&filter=" + encodeURIComponent(filter) + "&start=" + encodeURIComponent(start) + "&addFormSubmit=" + addFormSubmit;
	if (force == 1)
		req_str += "&force=1";
	r.doRequest(req_str);
}