var startNum = 1;
var scrollInterval = setInterval(showcaseRotator, 5000);

function showcaseRotator() 
{   
    
    var total = jQuery('div.showcase').size();
    var firstElement =  jQuery('div.showcase:first');
    var nextElement = jQuery('div.showcase:visible').next();
    
    if(total <= 1) {
        clearInterval(scrollInterval);
        return false;
    }
    
    jQuery('div.showcase:visible').fadeOut();
    
    var nextNum = ++startNum;
      
    if(nextNum > total) {
       var nextElement = firstElement;
       startNum = 1;
    }
   
    jQuery(nextElement).fadeIn('slow');   
    
}

jQuery(document).ready(function() {
    jQuery.noConflict();
    jQuery('div.showcase:first').show();
});