//blue space
var blue = new Image();
	blue.src = document.getElementById(bg_img_id).src;
	
//white space
var white = new Image();
	white.src = document.getElementById(slideshow_img_id).src;
	
// fade in image
change_image(blue.src, preLoad[current].src, bg_div_id, bg_img_id);

// set top-bg back to blue
document.getElementById(bg_div_id).style.background = "url(" + blue.src + ") center bottom no-repeat";

//set first slideshow image
document.getElementById(slideshow_img_id).src = preLoadSlideshow[preLoadSlideshow.length-1].src;

//set javascript timer function
var image_slideshow = window.setInterval('slideshow_change()', 2500);