function display( bloc )
{
	if ( bloc != null )
	{
		var display = getCssStyleValue( bloc , 'display' );
		if ( display == "none" )
		{
			bloc.style.display = "";
		}
		else
		{
			bloc.style.display = "none";
		}
	}
}


function getCssStyleValue(element , style ) 
{
	if ( element.currentStyle )
		return element.currentStyle[style];
	else
		return window.getComputedStyle(element,null).getPropertyValue(style);
}


function testMusic( music , name )
{
	if ( readCookie( "music" ) == "yes" )
	{
		music.innerHTML = '<p><object type="audio/mpeg" width="0" height="0" data="'+name+'"><param name="filename" value="'+name+'" /> <param name="autostart" value="true" /><param name="loop" value="true" /> <param name="display" value="false" /> </object></p>';
	}
	else
	{
		music.innerHTML = "";
	}
}


function playMusic( music , name )
{
	if ( readCookie( "music" ) == "yes" )
	{
		eraseCookie( "music" );
		music.innerHTML = "";
	}
	else
	{
		createCookie( "music", "yes", 1 );
		music.innerHTML = '<p><object type="audio/mpeg" width="0" height="0" data="'+name+'"><param name="filename" value="'+name+'" /> <param name="autostart" value="true" /><param name="loop" value="true" /> <param name="display" value="false" /> </object></p>';
	}
}

function launchMusic()
{
	createCookie( "music", "yes", 1 );
}

function createCookie( name, value, days )
{
	if (days) 
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else 
	{
		var expires = "";
	}
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) 
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) 
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie( name ) 
{
	createCookie( name, "", -1 );
}


function changeSpace( bloc , space )
{
	hideAll();
	display( bloc );
	
	var xhr = newXhr();
	
	xhr.open("GET", "pic_"+space+".html", true);
	xhr.send(null);
	xhr.onreadystatechange = function() {
		if (xhr.readyState == 4 && (xhr.status == 200 || xhr.status == 0)) 
		{
			var data = xhr.responseText;
			if ( document.getElementById('myGallery') != null )
			{
				document.getElementById( "myGallery" ).innerHTML = data; 
				var myGallery = new gallery(
					$('myGallery'), 
					{
						timed: true,
						showCarousel: false,
						showInfopane: false
					}
				);
			}
		}
	}
	
	
}


function newXhr()
{
	var xhr = null; 
	if(window.XMLHttpRequest) {
		xhr = new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		try {
			xhr = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
	} else {
		alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
		xhr = false; 
	} 
	return xhr;
}


function hideAll()
{
	var ps = document.getElementsByTagName( 'p' );
	
	for ( var i =0; i<ps.length; i++ )
	{
		var p = ps[i];
		if ( p.hasAttribute( 'id' ) && p.getAttribute( 'id' ) != '' )
		{
			document.getElementById( p.getAttribute( 'id' ) ).style.display = "none";
		}
	}
}