/* BG EXTENSIBLE */
/* background resizable */ 
function redimensionnement(){
  var image_width = $('.bg').width();
  var image_height = $('.bg').height();   
	
  var over = image_width / image_height;
  var under = image_height / image_width;
	
  var body_width = $(window).width();
  var body_height = $(window).height();
	
  if (body_width / body_height >= over) {
	$('.bg').css({
	  'width': body_width + 'px',
	  'height': Math.ceil(under * body_width) + 'px',
	  'left': '0px',
	  'top': Math.abs((under * body_width) - body_height) / -2 + 'px'
	});
  }
	
  else {
	$('.bg').css({
	  'width': Math.ceil(over * body_height) + 'px',
	  'height': body_height + 'px',
	  'top': '0px',
	  'left': Math.abs((over * body_height) - body_width) / -2 + 'px'
	});
  }
}
  
$(window).resize(function(){
	redimensionnement();
});
/* /BG EXTENSIBLE */

/* REDIMENSIONNEMENT BG */
$(window).load(function(){
	redimensionnement();
});
/* /REDIMENSIONNEMENT BG */

/*  PRELOAD RANDOM BACKGROUNDS */
var preload=new Array();
for (n=0;n<randomimages.length;n++){
    preload[n]=new Image();
    preload[n].src=randomimages[n];
}
/*  /PRELOAD RANDOM BACKGROUNDS */