isIE=document.all;
isNN=!document.all&&document.getElementById;
isN4=document.layers;
isActive=false;

// Set Netscape up to run the "captureMousePosition" function whenever
// the mouse is moved. For Internet Explorer and Netscape 6, you can capture
// the movement a little easier.
if (document.layers) { // Netscape
    document.captureEvents(Event.MOUSEMOVE);
    document.onmousemove = captureMousePosition;
} else if (document.all) { // Internet Explorer
    document.onmousemove = captureMousePosition;
} else if (document.getElementById) { // Netcsape 6
    document.onmousemove = captureMousePosition;
}
// Global variables
xMousePos = 0; // Horizontal position of the mouse on the screen
yMousePos = 0; // Vertical position of the mouse on the screen
xMousePosMax = 0; // Width of the page
yMousePosMax = 0; // Height of the page
halfx = 0; // centerline of the page

function captureMousePosition(e) {
    if (document.layers) {
        // When the page scrolls in Netscape, the event's mouse position
        // reflects the absolute position on the screen. innerHight/Width
        // is the position from the top/left of the screen that the user is
        // looking at. pageX/YOffset is the amount that the user has
        // scrolled into the page. So the values will be in relation to
        // each other as the total offsets into the page, no matter if
        // the user has scrolled or not.
        xMousePos = e.pageX;
        yMousePos = e.pageY;
        xMousePosMax = window.innerWidth+window.pageXOffset;
        yMousePosMax = window.innerHeight+window.pageYOffset;
    } else if (document.all) {
        // When the page scrolls in IE, the event's mouse position
        // reflects the position from the top/left of the screen the
        // user is looking at. scrollLeft/Top is the amount the user
        // has scrolled into the page. clientWidth/Height is the height/
        // width of the current page the user is looking at. So, to be
        // consistent with Netscape (above), add the scroll offsets to
        // both so we end up with an absolute value on the page, no
        // matter if the user has scrolled or not.
        xMousePos = window.event.x+document.body.scrollLeft;
        yMousePos = window.event.y+document.body.scrollTop;
        xMousePosMax = document.body.clientWidth+document.body.scrollLeft;
        yMousePosMax = document.body.clientHeight+document.body.scrollTop;
    } else if (document.getElementById) {
        // Netscape 6 behaves the same as Netscape 4 in this regard
        xMousePos = e.pageX;
        yMousePos = e.pageY;
        xMousePosMax = window.innerWidth+window.pageXOffset;
        yMousePosMax = window.innerHeight+window.pageYOffset;
        halfx = xMousePosMax / 2;
    }
        
}

function ToggleFloatingLayer(DivID,iState,lat,lon,xjMsgID,xjDirID) // 1 visible, 0 hidden
{
	// alert(lat + ":" + lon);
	if(document.layers)	   //NN4+
    {
       document.layers[DivID].visibility = iState ? "show" : "hide";
    }
    else if(document.getElementById)	  //gecko(NN6) + IE 5+
    {
        var obj = document.getElementById(DivID);
        
        //
        if (iState) {
        	// load the data into the div before turning it on
        	var sendInfo = 'send=xp&lat=' + lat + '&lon=' + lon + '&xjMsgID=' + xjMsgID + '&dirname=' + xjDirID;
        	var fetch = fetchData('/xjournal/xp_popup.php','xp_pop_content',sendInfo);
        }
            
    	if (halfx > 0) {
	        if (xMousePos > halfx) {
	        	// go to the left (this will prob always be true in IE)
	        	obj.style.top = yMousePos + 'px' ;
	       		obj.style.left = (xMousePos - 320) + 'px';
	       	} else {
	       		// go to the right
	       		obj.style.top = yMousePos + 'px' ;
	       		obj.style.left = (xMousePos+20) + 'px';
	       	}
    	} else {
    		// ie shows halfx=0... 
    		// go to the right
	       	obj.style.top = yMousePos + 'px' ;
	       	obj.style.left = (xMousePos+20) + 'px';
    	}
       	
        obj.style.visibility = iState ? "visible" : "hidden";
        
    }
    else if(document.all)	// IE 4
    {
        document.all[DivID].style.visibility = iState ? "visible" : "hidden";
    }
}


function fetchData(url,objectID,urldata) {
	// use ajax to get the data
	var pageRequest = false;
	
	if (window.XMLHttpRequest) pageRequest = new XMLHttpRequest();
	else if (window.ActiveXObject) pageRequest = new ActiveXObject("Microsoft.XMLHTTP");
	else return false;
	
	pageRequest.onreadystatechange = function () {
		var object = document.getElementById(objectID);
		var data = pageRequest.responseText;
		object.innerHTML = data;
	}
	
	pageRequest.open('POST',url,true);
	pageRequest.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	pageRequest.send(urldata);
	
	
	
}