/* 
 * Common Functions 
 */
 
// Detect Browser Capabilities
var capable = (document.getElementById && document.getElementsByTagName);



// New Window
var newwin = '';
// Mouse Position
var mouseX = 0;
var mouseY = 0;
// Event Target
var target = '';

var targetUrl;
function showConfirmation(url) {
    targetUrl = url;
    window.open('/confirmExternalLink.html','confirm','width=420,height=280,resizable=yes').focus();
}

// open a popup window
function popWindow(theUrl,width,height,full) {
    // use defaults if width and height were not supplied
    var ismoz = navigator.userAgent.indexOf("Gecko");
    var isie = navigator.userAgent.indexOf("MSIE");
    var default_width = 600;
    var default_height = 450;
    var offset_width = (isie != -1) ? 18 : 0;
    var offset_height = (isie != -1) ? 4 : 0;
    var popType = (full) ? ",scrollbars=yes,resizable=yes,status=yes,toolbar=yes,menubar=yes,location=yes,directories=yes" : ",scrollbars=yes,resizable=yes,status=no";
    
    var popWidth = (width) ? width + offset_width : default_width + offset_width;
    var popHeight = (height) ? height + offset_height : default_height + offset_height;
    var popLeft = self.screen.availWidth/2 - popWidth/2;
    var popTop = self.screen.availHeight/2 - popHeight/2;
    
    if(theUrl) {
        if(newwin)
            newwin.close();
        newwin = window.open(theUrl,'newwin','left='+popLeft+',top='+popTop+',width='+popWidth+',height='+popHeight+popType);
    }

    return;
}





// Multiple Onload Utility
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') 
	{
		window.onload = func;
	} 
	else 
	{
		window.onload = function() 
		{
			oldonload();
			func();
		}
	}
}

function newWinLinks() {
   for (var i=0; i < document.links.length; i++) {
      if (document.links[i].className == "popup") {
         document.links[i].onclick = linkclass_popup;
         }
      if (document.links[i].className == "msg") {
         document.links[i].onclick = linkclass_msg;
         }
      if (document.links[i].className == "new") {
         document.links[i].target = "_blank";
         }
      if (document.links[i].className == "same") {
         document.links[i].target = "_self";
         }
      // Add other if statements for different classes here
   }
}

addLoadEvent(newWinLinks);

function linkclass_popup() {
	popWindow(this.href,800,600,0);
	return false;
}

function linkclass_msg() {
	showConfirmation(this.href);
	return false;
}













// MenuImage constructor
function MenuImage(img_id, img_out, img_in, img_act, swapped) 
{
    this.img_id = img_id;           // the image id
    this.img_out = new Image();     // the image to use when mouseout
    this.img_out.src = imageDir + img_out;
    this.img_in = new Image();      // the image to use when mouseover
    this.img_in.src = imageDir + img_in;
    this.img_act = new Image();     // the image when page active
    if(img_act) {
        this.img_act.src = imageDir + img_act;
    } else {
        this.img_act.src = '';
    }    
    this.swapped = swapped;         // register if the image is swapped
    this.over = 0;                  // register if the image is 'over'
}

// take a full or partial path, and return it's last part
function basename(path) 
{
    var parts = path.split('/');
    return parts[parts.length -1];
}

// get an image from an image_id
function get_image(id)
{
    for(var a=0; a<=MImages.length; a++)
    {
        if(MImages[a].img_id == id)
            return a;
    }
}

// swap in the image
function imgIn(image_id)
{
    var imgId = get_image(image_id);

    if(capable && MImages[imgId]) 
    {
        var theObj = MImages[imgId];
        var theImg = document.getElementById(theObj.img_id);
        var filename = basename(theImg.src);

        // don't swap if image is 'down' or currently active 
        if( filename.indexOf('_at') == -1 &&
           (filename.indexOf('_over') == -1 || filename.indexOf('_on') == -1) ) 
        {
            theImg.src = MImages[imgId].img_in.src;
            MImages[imgId].swapped = 1;
        }
    }
}

// swap out the image
function imgOut(image_id) 
{
    var imgId = get_image(image_id);

    if(capable && MImages[imgId]) 
    {
        theImg = document.getElementById(MImages[imgId].img_id);
        // only revert if "swapped" is true
        if(MImages[imgId].swapped) 
        {
            theImg.src = MImages[imgId].img_out.src;
            MImages[imgId].swapped = 0;
        }
    }
}


/*
 * Functions to swap the background color of a div 
 */

var savedBG = new Array();

function changeBG(id, color)
{
    if(capable && id && color)
    {
        var objStyle = document.getElementById(id).style;
        savedBG[id] = objStyle.backgroundColor;
        objStyle.backgroundColor = "#"+color;
    }
}

function changeBackBG(id)
{
    if(capable && id && savedBG[id])
    {
        var objStyle = document.getElementById(id).style;
        objStyle.backgroundColor = savedBG[id];
        savedBG[id] = ""; 
    }
}


/*
 * Functions to open links in a new window
 */


// This will convert the querystring to an associative array
function querystring_to_array(q)
{
    var arr1 = q.split('&'); 
    var arr2 = new Array();
    var arr3 = new Array();

    for(var i=0; i<arr1.length; i++) {
        arr2 = arr1[i].split('=');
        arr3[arr2[0]] = arr2[1]; 
    }

    return arr3;
}