mapIntervalID = null;
function refreshMap(){
	if(mapIntervalID!=null){
		clearTimeout(mapIntervalID);
	}
	mapIntervalID = setTimeout("refreshMapTimeout('advertsGMaps')", 75);
}
xmlhttpRefreshMap=null;
function refreshMapTimeout(func){
	if (xmlhttpRefreshMap==null) xmlhttpRefreshMap = newAjax();
	
	var fromCountry = document.getElementById("fromCountryGM").value;
	var fromProvince = document.getElementById("fromProvinceGM").value;	
	var fromCity = document.getElementById("fromCityGM").value;
	var toCountry = document.getElementById("toCountryGM").value;
	var toProvince = document.getElementById("toProvinceGM").value;	
	var toCity = document.getElementById("toCityGM").value;
	
	map.clearOverlays();
	resetLimits();
	
	var urlServlet = "sharelingServlet.php";
	var paramsGET = "?func="+func+"&fromCountry="+fromCountry+"&fromProvince="+fromProvince+"&fromCity="+fromCity+"&toCountry="+toCountry+"&toProvince="+toProvince+"&toCity="+toCity;
	
	if(xmlhttpRefreshMap.readyState!=2 && xmlhttpRefreshMap.readyState!=3){
		callAjax(callbackRefreshMap, paramsGET, urlServlet, xmlhttpRefreshMap);
	}
}

function callbackRefreshMap(xmlhttp){
	var stretchsDemands = xmlhttp.responseXML.getElementsByTagName("demand");
	drawStretchs(stretchsDemands, "#ffb100");
	var stretchsOffers = xmlhttp.responseXML.getElementsByTagName("offer");
	drawStretchs(stretchsOffers, "#19aea2");
	
	var num = stretchsDemands.length + stretchsOffers.length;
	if(num==0){
		map.setCenter(new google.maps.LatLng(40.416706, -3.703269), 1);
	}else{
		showAllPoints();
	}	
}

function drawStretchs(stretchs, color){
	for(i=0; i< stretchs.length; i++){
		var fromLat = stretchs[i].getAttribute("fromLat");
		var fromLng = stretchs[i].getAttribute("fromLng");
		var toLat = stretchs[i].getAttribute("toLat");
		var toLng = stretchs[i].getAttribute("toLng");
		var pointA = new google.maps.LatLng(fromLat, fromLng);
		var pointB = new google.maps.LatLng(toLat, toLng);
		drawLine(pointA, pointB, color);
	}
}

function drawLine(pointA, pointB, color){
	var linePoints = [];
	linePoints.push(pointA);
	linePoints.push(pointB);
	setLimits(pointA);
	setLimits(pointB);
	map.addOverlay(new google.maps.Polyline(linePoints, color, 2, 1));		
}