//	ActivateMenu()
//	
//	Create hover behavior for horizontal menus
//	Handled with CSS except for IE, this code simulates CSS

function ActivateMenu() 
{
    InitCookies();
 
	// name of one and only menu
	var nav = 'nav';
	
	/* currentStyle restricts the Javascript to IE only */
	if (document.all && document.getElementById(nav).currentStyle)
	{  
        var navroot = document.getElementById(nav);
        
        /* Get all the list items within the menu */
        var lis=navroot.getElementsByTagName("LI");  
    
        for (i=0; i<lis.length; i++)
        {
           /* If the LI has another menu level */
            if(lis[i].lastChild.tagName=="UL")
           	{
                /* assign the function to the LI */
             	lis[i].onmouseover=function()
             	{	
                
                   /* display the inner menu */
                   this.lastChild.style.display="block";
                }
                lis[i].onmouseout=function() 
                {   
                   this.lastChild.style.display="none";
                }
            }
        }
    }
}

// Looks for command line arguments to set cookies
function InitCookies()
{
    // Get commandline args
    var args = getArgs();

    // Create cookie "arg" for command line arguments
    var argsCookie = new Cookie(document, "args");
    
    // Look for "source" argument
    if(args.source)
    {
        // Create value "source" for cookie "args"
        argsCookie.source = args.source;
    }
    
    // Store the "args" cookie
    argsCookie.store();
}


// This function looks for a cookie named "args" and get the value set for "source"
function GetSource()
{
    // Get arg cookie
    // Create cookie for command line arguments
    var argsCookie = new Cookie(document, "args");
    
    // Load cookie values
    argsCookie.load();
    
    // Return value of source
    var source = "";
    if (argsCookie.source)
    {
        source = argsCookie.source
    }
    
    return source;
}


// This function parses comma-separated name=value argument pairs from
// the query string of the URL. It stores the name=value pairs in 
// properties of an object and returns that object.
//
// Source: Javascript: The Definitive Guide (4th edition) by David Flanagan - Example 13-5

function getArgs() {
    var args = new Object();
    var query = location.search.substring(1);     // Get query string.
    var pairs = query.split(",");                 // Break at comma.
    for(var i = 0; i < pairs.length; i++) {
	var pos = pairs[i].indexOf('=');          // Look for "name=value".
	if (pos == -1) continue;                  // If not found, skip.
	var argname = pairs[i].substring(0,pos);  // Extract the name.
	var value = pairs[i].substring(pos+1);    // Extract the value.
	args[argname] = unescape(value);          // Store as a property.
	// In JavaScript 1.5, use decodeURIComponent() instead of escape()
    }
    return args;                                  // Return the object.
}


// The constructor function: creates a cookie object for the specified
// document, with a specified name and optional attributes.
// Arguments:
//   document: The Document object that the cookie is stored for. Required.
//   name:     A string that specifies a name for the cookie. Required.
//   hours:    An optional number that specifies the number of hours from now
//             that the cookie should expire.
//   path:     An optional string that specifies the cookie path attribute.
//   domain:   An optional string that specifies the cookie domain attribute.
//   secure:   An optional Boolean value that, if true, requests a secure cookie.
//
// Source: Javascript: The Definitive Guide (4th edition) by David Flanagan - Example 16-1

function Cookie(document, name, hours, path, domain, secure)
{
    // All the predefined properties of this object begin with '$'
    // to distinguish them from other properties which are the values to
    // be stored in the cookie.
    this.$document = document;
    this.$name = name;
    if (hours)
        this.$expiration = new Date((new Date()).getTime() + hours*3600000);
    else this.$expiration = null;
    if (path) this.$path = path; else this.$path = null;
    if (domain) this.$domain = domain; else this.$domain = null;
    if (secure) this.$secure = true; else this.$secure = false;
}

// This function is the store() method of the Cookie object.
Cookie.prototype.store = function () {
    // First, loop through the properties of the Cookie object and
    // put together the value of the cookie. Since cookies use the
    // equals sign and semicolons as separators, we'll use colons
    // and ampersands for the individual state variables we store 
    // within a single cookie value. Note that we escape the value
    // of each state variable, in case it contains punctuation or other
    // illegal characters.
    var cookieval = "";
    for(var prop in this) {
        // Ignore properties with names that begin with '$' and also methods.
        if ((prop.charAt(0) == '$') || ((typeof this[prop]) == 'function')) 
            continue;
        if (cookieval != "") cookieval += '&';
        cookieval += prop + ':' + escape(this[prop]);
    }

    // Now that we have the value of the cookie, put together the 
    // complete cookie string, which includes the name and the various
    // attributes specified when the Cookie object was created.
    var cookie = this.$name + '=' + cookieval;
    if (this.$expiration)
        cookie += '; expires=' + this.$expiration.toGMTString();
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    if (this.$secure) cookie += '; secure';

    // Now store the cookie by setting the magic Document.cookie property.
    this.$document.cookie = cookie;
}

// This function is the load() method of the Cookie object.
Cookie.prototype.load = function() { 
    // First, get a list of all cookies that pertain to this document.
    // We do this by reading the magic Document.cookie property.
    var allcookies = this.$document.cookie;
    if (allcookies == "") return false;

    // Now extract just the named cookie from that list.
    var start = allcookies.indexOf(this.$name + '=');
    if (start == -1) return false;   // Cookie not defined for this page.
    start += this.$name.length + 1;  // Skip name and equals sign.
    var end = allcookies.indexOf(';', start);
    if (end == -1) end = allcookies.length;
    var cookieval = allcookies.substring(start, end);

    // Now that we've extracted the value of the named cookie, we've
    // got to break that value down into individual state variable 
    // names and values. The name/value pairs are separated from each
    // other by ampersands, and the individual names and values are
    // separated from each other by colons. We use the split method
    // to parse everything.
    var a = cookieval.split('&');    // Break it into array of name/value pairs.
    for(var i=0; i < a.length; i++)  // Break each pair into an array.
        a[i] = a[i].split(':');

    // Now that we've parsed the cookie value, set all the names and values
    // of the state variables in this Cookie object. Note that we unescape()
    // the property value, because we called escape() when we stored it.
    for(var i = 0; i < a.length; i++) {
        this[a[i][0]] = unescape(a[i][1]);
    }

    // We're done, so return the success code.
    return true;
}

// This function is the remove() method of the Cookie object.
Cookie.prototype.remove = function() {
    var cookie;
    cookie = this.$name + '=';
    if (this.$path) cookie += '; path=' + this.$path;
    if (this.$domain) cookie += '; domain=' + this.$domain;
    cookie += '; expires=Fri, 02-Jan-1970 00:00:00 GMT';

    this.$document.cookie = cookie;
}