Ajax Website with Flash

i have already started to design a new website. look at [login to view URL] i want that the user will see on the first side the flash slideshow. as soon the user clicks on the button the slideshow get smaller. this feature works only on the first two main button. on the sub butten it does not work and need to be fixed. if ajax works i want that the link will get the var ajax=1 example http://webcam.gaschurn.info/test/index_layout.php&ajax=1 if ajax is 1 i want that only the content of the main div will be changed by fade in. if ajax is 0 i want that the whole side will be loadet. this should make the website faster and cross browser useable. maybe you have a better idea. for the image-slide on the mainpage i use slideshowpro.com. as soon the slideshow gets small i want that a var will be send to the slideshow to change the sliding gallery. (so i can load smaller images on the top slide. i also have a contact form with a loot of fieldds. as soon the fields are field in i want to show a green image. if soom rquired field are missing i want that there will apere a red image. the contact form also needs a callendar. it is very important that the website is fast and works on all main browsers.