var xmlNBHttp = createXmlHttpRequestObject();

var nbcache = new Array();

	
	function addToNotebook(val, id, img, txt) {


	  if(xmlNBHttp) {
	    if (val) {
		var el = document.getElementById(id);
		if (el) {
			el.innerHTML = img;
		}
	      val = encodeURIComponent(val);
	      nbcache.push(val);
	    }
	    
	    try  {
	      if ((xmlNBHttp.readyState == 4 || xmlNBHttp.readyState == 0) && nbcache.length > 0)  {
	        // get a new set of parameters from the scache
	        var scacheEntry = nbcache.shift();
	
	        // make a server request to validate the extracted data
	        xmlNBHttp.open("GET", '/notebook/add/'+scacheEntry, true);
	        xmlNBHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	        xmlNBHttp.onreadystatechange = function() {
			  if (xmlNBHttp.readyState == 4)  {
			    if (xmlNBHttp.status == 200) {
			      try {

					if (el) {
						el.innerHTML = txt;
					}			      	
			        setTimeout("addToNotebook();", 500);
			      
			      } catch (e) {
			      	alert(e.toString());
			      }
			    }
			  }
	        	
	        };
	        
	        xmlNBHttp.send(null);
	      }
	    }
	    catch (e)   {
	    }
	  }
	}

    function collapseItem(obj, plusurl, minusurl) {
        var el = document.getElementById(obj);
        if (el) {
            if ( el.style.display != "none" ) {
                el.style.display = 'none';
                }
            else {
                el.style.display = '';
            }
            
            if (document.images && document.images['img'+obj]) {
                if (document.images['img'+obj].src.indexOf(minusurl)>-1) {
                    document.images['img'+obj].src = plusurl;
                } else { 
                    document.images['img'+obj].src = minusurl;
                }
            }
        }
    }

        function getStyleObject(objectId) {
        // cross-browser function to get an object's style object given its id
        if(document.getElementById && document.getElementById(objectId)) {
        // W3C DOM
        return document.getElementById(objectId).style;
        } else if (document.all && document.all(objectId)) {
        // MSIE 4 DOM
        return document.all(objectId).style;
        } else if (document.layers && document.layers[objectId]) {
        // NN 4 DOM.. note: this won't find nested layers
        return document.layers[objectId];
        } else {
        return false;
        }
    } // getStyleObject
    
    function changeObjectVisibility(objectId, newVisibility) {
        // get a reference to the cross-browser style object and make sure the object exists
        var styleObject = getStyleObject(objectId);
        if(styleObject) {
        styleObject.visibility = newVisibility;
        return true;
        } else {
        // we couldn't find the object, so we can't change its visibility
        return false;
        }
    } // changeObjectVisibility
    
    function moveObject(objectId, newXCoordinate, newYCoordinate) {
        // get a reference to the cross-browser style object and make sure the object exists
        var styleObject = getStyleObject(objectId);
        if(styleObject) {
            styleObject.left = newXCoordinate+"px";
            styleObject.top = newYCoordinate+"px";
        } else {
            // we couldn't find the object, so we can't very well move it
            return false;
        }
    } // moveObject
    
    var xOffset = -200;
    var yOffset = -5;
    
    function showPopup (targetObjectId, eventObj, offy, offx) {

    	if (offx) {
    		xOffset = offx;
    	}
    	
    	if (offy) {
			yOffset = offy;
    	}

        if(eventObj) {
        // hide any currently-visible popups
        hideCurrentPopup();
        // stop event from bubbling up any farther
        eventObj.cancelBubble = true;
        // move popup div to current cursor position 
        // (add scrollTop to account for scrolling for IE)

        var scrollX = 0;
        var scrollY = 0;

        // IE6 +4.01 and user has scrolled
        if (document.documentElement && document.documentElement.scrollTop) {
         scrollX = document.documentElement.scrollLeft;
         scrollY = document.documentElement.scrollTop;
        // IE5 or DTD 3.2
        } else if (document.body && document.body.scrollTop) {
         scrollY = document.body.scrollTop;
         scrollX = document.body.scrollLeft;
        } 
        
        var newXCoordinate = (eventObj.pageX) ? eventObj.pageX + xOffset : eventObj.x + xOffset + scrollX;
        var newYCoordinate = (eventObj.pageY) ? eventObj.pageY + yOffset : eventObj.y + yOffset + scrollY;
        moveObject(targetObjectId, newXCoordinate, newYCoordinate);

        // and make it visible
        if( changeObjectVisibility(targetObjectId, 'visible') ) {
            // if we successfully showed the popup
            // store its Id on a globally-accessible object
            window.currentlyVisiblePopup = targetObjectId;
            return true;
        } else {
            // we couldn't show the popup, boo hoo!
            return false;
        }
        } else {
        // there was no event object, so we won't be able to position anything, so give up
        return false;
        }
    } // showPopup
    
    function hideCurrentPopup() {
        // note: we've stored the currently-visible popup on the global object window.currentlyVisiblePopup
        if(window.currentlyVisiblePopup) {
        changeObjectVisibility(window.currentlyVisiblePopup, 'hidden');
        window.currentlyVisiblePopup = false;
        }
    } // hideCurrentPopup
    
    
    
    // ***********************
    // hacks and workarounds *
    // ***********************
    
    // initialize hacks whenever the page loads
    window.onload = initializeHacks;
    
    // setup an event handler to hide popups for generic clicks on the document
    document.onclick = hideCurrentPopup;
    
    function initializeHacks() {
        // this ugly little hack resizes a blank div to make sure you can click
        // anywhere in the window for Mac MSIE 5
        if ((navigator.appVersion.indexOf('MSIE 5') != -1) 
        && (navigator.platform.indexOf('Mac') != -1)
        && getStyleObject('blankDiv')) {
        window.onresize = explorerMacResizeFix;
        }
        resizeBlankDiv();
        // this next function creates a placeholder object for older browsers
        createFakeEventObj();
    }
    
    function createFakeEventObj() {
        // create a fake event object for older browsers to avoid errors in function call
        // when we need to pass the event object to functions
        if (!window.event) {
        window.event = false;
        }
    } // createFakeEventObj
    
    function resizeBlankDiv() {
        // resize blank placeholder div so IE 5 on mac will get all clicks in window
        if ((navigator.appVersion.indexOf('MSIE 5') != -1) 
        && (navigator.platform.indexOf('Mac') != -1)
        && getStyleObject('blankDiv')) {
        getStyleObject('blankDiv').width = document.body.clientWidth - 20;
        getStyleObject('blankDiv').height = document.body.clientHeight - 20;
        }
    }
    
    function explorerMacResizeFix () {
        location.reload(false);
    }

	function hideDiv(id) {
		var el = document.getElementById(id);
		
		if (el) {
			el.style.visibility = 'hidden';
			el.style.display = 'none';
		}
	}    

	function showDiv(id) {
		var el = document.getElementById(id);
		
		if (el) {
			el.style.visibility = 'visible';
			el.style.display = 'block';
		}
	}    

function changeMap(n, t, val) {
    if(t == 'block') {
        $m('imgmap0').src = '/images/map_browse_'+n+'.gif';
    } else {
    	if (val) {
        $m('imgmap0').src = val;
    	} else {
        $m('imgmap0').src = '/images/map_browse.gif';
    	}
    }
    return true;
}