$(window).load(function() {  
	var theWindow = $(window);
	
	// img background
	//$('#fixedbg_img').attr('src','../../images/body-background.jpg');
	
	//position verticale automatique
	var difHeight = theWindow.height() - 590;
	var margTop = difHeight/2;
	$('#global').css('margin-top',margTop);
});