var zz = 1;
var thesource = '';
var current = 1;
var zzold = 0;

function preload(source){
	var img = new Image();
	thesource = source;
	img.onload = next;
	img.src = source;
}
function image_change(){
	
	zzold = zz;
	
	nr_imgs = bg_imgs.length;

	zz = random_nr(nr_imgs);
	
	while(zz == zzold && nr_imgs > 2){
		zz = random_nr(nr_imgs);
	}
	
	var theimg = bg_imgs[zz];

	preload(theimg);	
	
}
function random_nr(nr){
	zz = 1 + Math.floor((nr - 1)*(Math.random()));
	return zz;
}
function show_img(){
	if(current == 2){
		document.getElementById('wg_banner_img2').style.backgroundImage = 'url(' + thesource + ')';
		$('#wg_banner_img2').fadeIn('slow');
		current = 1;
	}
	else{
		document.getElementById('wg_banner_img').style.backgroundImage = 'url(' + thesource + ')';
		$('#wg_banner_img2').fadeOut('slow');
		current = 2;
	}
	setTimeout("image_change()", 10000);

}
function next(){
	show_img();	
}