var _fade_state = 0;
var dur = 2.0;

function switch_logo() {

if (_fade_state == 0) {
new Effect.Fade('slideimg1', {duration: dur});        
new Effect.Appear('slideimg2', {duration: dur});

} 

else if (_fade_state == 1) {

new Effect.Fade('slideimg2', {duration: dur});        
new Effect.Appear('slideimg3', {duration: dur});        

} 

else if (_fade_state == 2) {
new Effect.Fade('slideimg3', {duration: dur});        
new Effect.Appear('slideimg1', {duration: dur});        

} 



//% is number of slides 
  _fade_state = ( _fade_state + 1)%3;
}
	
window.setInterval("switch_logo()",7000);