function random_theme(){
	j=parseInt(Math.random()*(pics));
	j++;//avoid 0
	
	header_images[j] = new Image(702,242);
	header_images[j].src = 'images/header'+j+'.jpg';
	
	content_backgrounds[j] = new Image(702,610);
	content_backgrounds[j].src = 'images/content'+j+'.jpg';
	
	header_img = document.getElementById('header');
	header_img.style.background ='url('+header_images[j].src+')';
	
	content_background = document.getElementById('content');
	content_background.style.background ='url('+content_backgrounds[j].src+')';
	
	footer_background = document.getElementById('footer');
	footer_background.style.background = footer_colors[j];
	
	headline_color = document.getElementById('h1');
	headline_color.style.color = text_colors[j];

	for (var i=1; i<=pics; i++){
		header_images[i] = new Image(702,242);
		header_images[i].src = 'images/header'+i+'.jpg';
		content_backgrounds[i] = new Image(702,610);
		content_backgrounds[i].src = 'images/content'+i+'.jpg';
	}
	setTimeout("random_theme()", 20000);
}