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/* ===========================================================================
 *
 * JQuery URL Parser
 * Version 1.0
 * Parses URLs and provides easy access to information within them.
 *
 * Author: Mark Perkins
 * Author email: mark@allmarkedup.com
 *
 * For full documentation and more go to http://projects.allmarkedup.com/jquery_url_parser/
 *
 * ---------------------------------------------------------------------------
 *
 * CREDITS:
 *
 * Parser based on the Regex-based URI parser by Stephen Levithian.
 * For more information (including a detailed explaination of the differences
 * between the 'loose' and 'strict' pasing modes) visit http://blog.stevenlevithan.com/archives/parseuri
 *
 * ---------------------------------------------------------------------------
 *
 * LICENCE:
 *
 * Released under a MIT Licence. See licence.txt that should have been supplied with this file,
 * or visit http://projects.allmarkedup.com/jquery_url_parser/licence.txt
 *
 * ---------------------------------------------------------------------------
 * 
 * EXAMPLES OF USE:
 *
 * Get the domain name (host) from the current page URL
 * jQuery.url.attr("host")
 *
 * Get the query string value for 'item' for the current page
 * jQuery.url.param("item") // null if it doesn't exist
 *
 * Get the second segment of the URI of the current page
 * jQuery.url.segment(2) // null if it doesn't exist
 *
 * Get the protocol of a manually passed in URL
 * jQuery.url.setUrl("http://allmarkedup.com/").attr("protocol") // returns 'http'
 *
 */

jQuery.url = function()
{
	var segments = {};
	
	var parsed = {};
	
	/**
    * Options object. Only the URI and strictMode values can be changed via the setters below.
    */
  	var options = {
	
		url : window.location, // default URI is the page in which the script is running
		
		strictMode: false, // 'loose' parsing by default
	
		key: ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"], // keys available to query 
		
		q: {
			name: "queryKey",
			parser: /(?:^|&)([^&=]*)=?([^&]*)/g
		},
		
		parser: {
			strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/, // more intuitive, fails on relative paths and deviates from specs
			loose:  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/ //less intuitive, more accurate to the specs
		}
		
	};
	
	var parseUri = function()
	{
		str = decodeURI( options.url );
		
		var m = options.parser[ options.strictMode ? "strict" : "loose" ].exec( str );
		var uri = {};
		var i = 14;

		while ( i-- ) {
			uri[ options.key[i] ] = m[i] || "";
		}

		uri[ options.q.name ] = {};
		uri[ options.key[12] ].replace( options.q.parser, function ( $0, $1, $2 ) {
			if ($1) {
				uri[options.q.name][$1] = $2;
			}
		});

		return uri;
	};

	var key = function( key )
	{
		if ( ! parsed.length )
		{
			setUp(); // if the URI has not been parsed yet then do this first...	
		} 
		if ( key == "base" )
		{
			if ( parsed.port !== null && parsed.port !== "" )
			{
				return parsed.protocol+"://"+parsed.host+":"+parsed.port+"/";	
			}
			else
			{
				return parsed.protocol+"://"+parsed.host+"/";
			}
		}
	
		return ( parsed[key] === "" ) ? null : parsed[key];
	};
	
	var param = function( item )
	{
		if ( ! parsed.length )
		{
			setUp(); // if the URI has not been parsed yet then do this first...	
		}
		return ( parsed.queryKey[item] === null ) ? null : parsed.queryKey[item];
	};
	var setUp = function()
	{
		parsed = parseUri();
		
		getSegments();	
	};
	
	var getSegments = function()
	{
		var p = parsed.path;
		segments = []; // clear out segments array
		segments = parsed.path.length == 1 ? {} : ( p.charAt( p.length - 1 ) == "/" ? p.substring( 1, p.length - 1 ) : path = p.substring( 1 ) ).split("/");
	};
	
	return {
		
		setMode : function( mode )
		{
			strictMode = mode == "strict" ? true : false;
			return this;
		},
		setUrl : function( newUri )
		{
			options.url = newUri === undefined ? window.location : newUri;
			setUp();
			return this;
		},		
		
		segment : function( pos )
		{
			if ( ! parsed.length )
			{
				setUp(); // if the URI has not been parsed yet then do this first...	
			} 
			if ( pos === undefined )
			{
				return segments.length;
			}
			return ( segments[pos] === "" || segments[pos] === undefined ) ? null : segments[pos];
		},
		
		attr : key, // provides public access to private 'key' function - see above
		
		param : param // provides public access to private 'param' function - see above
		
	};
	
}();

$(function(){

	//Navegacion
	$page = $.url.param("p");
	if(typeof $page === 'undefined') {
		$page = 'inicio';
	}
	
	$('nav ul li a').each(function(){
		var $href = $(this).attr('href');
		if ($href.toLowerCase().indexOf($page) >= 0){
			$(this).parent().addClass('activo');
		} else {
			$(this).parent().removeClass('activo');
		}
		if($page == 'inicio'){
			$(this).closest('ul').find('li:eq(0)').addClass('activo');
		}
	});
	
});

<ul>
    <li><a href="<?php echo $url;?>">INICIO</a></li>
    <li><a href="<?php echo $url;?>?p=page">NUESTRA EMPRESA</a></li>
</ul>

<?php

    if(isset($_GET['p']) && $_GET['p'] != ''){
        $seccion = $_GET['p'];
    }
    else{
        $seccion = 'inicio';
    }

    sectionWeb($seccion);
?>

<?php

// detect a localhost of a domain up
$weblocal = 'folderweb/'; //localhost folder
$server = $_SERVER['SERVER_NAME'];

if(strstr($server, '192.168.1.10') || strstr($server, 'localhost')){
	$url = "http://" . $_SERVER['SERVER_NAME'] . "/" . $weblocal;
} else {
	$url = "http://" . $_SERVER['SERVER_NAME'] . "/";
}

//must exist the file section with the same name in the navigation
function sectionWeb($seccion){
	global $url;
	if(file_exists('vistas/' . $seccion . '.php')){
        if(isset($_GET['s']) && $_GET['s'] != ''){
            $subpage = $_GET['s'];
            if(file_exists('vistas/' . $subpage . '.php'))
                include('vistas/' . $subpage . '.php');
            else
                include('vistas/' . $seccion . '.php');
        } else {
            include('vistas/' . $seccion . '.php');
        }
    } else{
        include('vistas/inicio.php');
    }
}
?>