/*
url-loading object -  from AJAX in Action / Dave Crane / Eric Pascarello / Darren James
*/

/* namespacing object */
var net = new Object();

net.READY_STATE_UNINITIALIZED = 0;
net.READY_STATE_LOADING = 1;
net.READY_STATE_LOADED = 2;
net.READY_STATE_INTERACTIVE = 3;
net.READY_STATE_COMPLETE = 4;


/*--- content loader object for cross-browser requests ---*/
net.ContentLoader = function(url, onload, onerror, method, params, contentType) {
    this.req = null;
    this.onload = onload;
    this.onerror = (onerror) ? onerror : this.defaultError;
    this.loadXMLDoc(url, method, params, contentType);
}

net.ContentLoader.prototype.loadXMLDoc = function(url, method, params, contentType) {
    if (!method) {
        method = "GET";
    }
    if (!contentType && method == "POST") {
        contentType = 'application/x-www-form-urlencoded';
    }
    if (window.XMLHttpRequest) {
        this.req = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        this.req = new ActiveXObject("Microsoft.XMLHTTP");
    }
    if (this.req) {
        try {
            var loader = this;
            this.req.onreadystatechange = function() {
                net.ContentLoader.onReadyState.call(loader);
            }
            this.req.open(method, url, true);
            if (contentType) {
                this.req.setRequestHeader('Content-Type', contentType);
            }
            this.req.send(params);
        } catch (err) {
            this.onerror.call(this);
        }
    }
}


net.ContentLoader.onReadyState = function() {
    var req = this.req;
    var ready = req.readyState;
    if (ready == net.READY_STATE_COMPLETE) {
        var httpStatus = req.status;
        if (httpStatus == 200 || httpStatus == 0) {
            this.onload.call(this);
        } else {
            this.onerror.call(this);
        }
    }
}

net.ContentLoader.prototype.defaultError = function() {
    alert("error fetching data!"
            + "\n\nreadyState:" + this.req.readyState
            + "\nstatus: " + this.req.status
            + "\nheaders: " + this.req.getAllResponseHeaders());
}

/*  Duke-specific functions */
var xmlDoc;
var objOutput;
var objExpanded;


function onXMLLoad() {
    objOutput.innerHTML = '';
    objOutput.innerHTML = this.req.responseText;
}

function onError() {
    objOutput.innerHTML = '';
    objOutput.innerHTML = 'An error has occured';
}


function load_map(z, x, y, h, bid, pid) {
    xmlDoc = null;
    objOutput = document.getElementById('map_image');

    var url = '/map_page.php?z=' + z + '&x=' + x + '&y=' + y + '&h=' + h + '&w=' + objOutput.offsetWidth;
    if (bid) url += '&bid=' + bid;
    if (pid) url += '&pid=' + pid;
    objOutput.innerHTML = "Loading map...";

    new net.ContentLoader(url, onXMLLoad, onError);
}

function select_tab(id) {
	var tabs = document.getElementById('tabs').getElementsByTagName('li');
	for (i = 0; i < tabs.length; i++) {
		section = tabs[i].id.replace(/_tab/, "");
		div = document.getElementById(section);
		tab = document.getElementById(tabs[i].id);
		if (section == id) {
			div.style.display = "block";
			tab.className = "selected";
		}
		else {
			div.style.display = "none";
			tab.className = "";
		}
	}
}

function toggle(id) {
    obj = document.getElementById(id);
    if (obj.style.display == "block") {
	obj.style.display = "none";
    }
    else {
        obj.style.display = "block";
    }
}


function changeStyle(file){ 
	var _head = document.getElementsByTagName('head')[0];
	document.styleSheets[0].disabled = true;
	var _link = document.createElement('link');
	    _link.type = 'text/css';
	    _link.href = file;
	    _link.rel = 'stylesheet';
	    _head.appendChild(_link);
}