var req = null;

var site_root= "";

function InitXMLHttpRequest() {

	// Make a new XMLHttp object

	if (window.XMLHttpRequest) {

		req = new XMLHttpRequest();

	} else if (window.ActiveXObject) {

		req = new ActiveXObject("Microsoft.XMLHTTP");

	}

}





function AddToComparisonList(id_ad, destination_id) {

	InitXMLHttpRequest();



	var destination = document.getElementById(destination_id);

	// Load the result from the response page

	if (req) {					

		req.onreadystatechange = function() {

			if (req.readyState == 4) {

				destination.innerHTML = req.responseText;



				//document.getElementById("comparison_menu").style.visibility = "visible";

				document.getElementById("comparison_str").style.display = "inline";

				RefreshComparisonStr("comparison_str");

				//RefreshComparisonList("comparison_list");

			} else {

				destination.innerHTML = "Loading data...";

			}

		}

		req.open("GET", site_root+"/comparison_list.php?id_ad=" + id_ad);

		req.send(null);	

	} else {

		destination.innerHTML = 'Browser unable to create XMLHttp Object';

	}

}



function RefreshComparisonList(destination_id) {

	InitXMLHttpRequest();



	var destination = document.getElementById(destination_id);

	// Load the result from the response page

	if (req) {

		req.onreadystatechange = function() {

			if (req.readyState == 4) {

				if (req.responseText == "empty") {

					//document.getElementById("comparison_menu").style.visibility = "hidden";

					document.getElementById("comparison_str").style.display = "none";

					destination.innerHTML = "";

				} else {

					destination.innerHTML = req.responseText;

				}

			} else {

				destination.innerHTML = "Loading data...";

			}

		}

		req.open("GET", site_root + "/comparison_list.php?action=get_list");

		req.send(null);				

	} else {

		destination.innerHTML = 'Browser unable to create XMLHttp Object';

	}

}



function RefreshComparisonStr(destination_id) {

	InitXMLHttpRequest();



	var destination = document.getElementById(destination_id);

	// Load the result from the response page

	if (req) {

		req.onreadystatechange = function() {

			if (req.readyState == 4) {

				if (req.responseText == "empty") {

					//document.getElementById("comparison_menu").style.visibility = "hidden";

					destination.style.display = "none";

					destination.innerHTML = "";

				} else {

					destination.style.display = "inline";

					destination.innerHTML = req.responseText;					

				}

			} else {

				destination.innerHTML = "Loading data...";

			}

		}				

		req.open("GET", site_root + "/comparison_list.php?action=get_str");

		req.send(null);		

	} else {

		destination.innerHTML = 'Browser unable to create XMLHttp Object';

	}

}



function ClearComparisonList(destination_id) {

	InitXMLHttpRequest();



	var destination = document.getElementById(destination_id);

	// Load the result from the response page

	if (req) {		

		req.onreadystatechange = function() {

			if (req.readyState == 4) {

				eval(req.responseText);

				destination.innerHTML = "";

				//document.getElementById("comparison_menu").style.visibility = "hidden";

				document.getElementById("comparison_str").style.display = "none";

			} else {

				destination.innerHTML = "Loading data...";

			}

		}		

		req.open("GET", site_root + "/comparison_list.php?action=clear_list");

		req.send(null);

	} else {

		destination.innerHTML = 'Browser unable to create XMLHttp Object';

	}

}



function DeleteFromComparisonList(destination_id, id_ad) {

	InitXMLHttpRequest();



	var destination = document.getElementById(destination_id);

	// Load the result from the response page

	if (req) {		

		req.onreadystatechange = function() {

			if (req.readyState == 4) {

				eval(req.responseText);

				destination.innerHTML = "";

				RefreshComparisonList("comparison_list");				

			} else {

				destination.innerHTML = "Loading data...";

			}

		}		

		req.open("GET", site_root + "/comparison_list.php?action=delete_ad&id_ad=" + id_ad);

		req.send(null);

	} else {

		destination.innerHTML = 'Browser unable to create XMLHttp Object';

	}

}