350718 Remove loading time in ASP .JS

I have a cookie script writted in javascript on my site at [login to view URL] Here's how the script works right now. When someone goes to a special URL like ( [login to view URL] ) it will change three images in the header "after" page load. This javascript will also allow me to create an unlimited amount of variables like (private1, private2, private3... for different image sets.) The problem with this script is that you can see the original images untill the entire page is loaded THEN FINALLY the images change. I need someone to fix this script or rewrite it in .ASP so when the page loads it will load different images right away. I DO NOT want to see the original images first. If you can fix this, let me know and PMB and tell me how you can fix this. I will choose someone right away.