var slide_num;
	var zStart;
	var curr_slide = 1;
	var foTime = 2000;
	var roTime = 6000;

	$(document).ready(function(){
		slide_num = $("#slide_box > .slide").size();
		zStart=slide_num+2;
	
		for(var i = 1; i <= slide_num; i++){
			$("#slide_"+i).css({zIndex:zStart-i});
		}
		setInterval(rotate,roTime);
	
	});
		
	function rotate(){
		var next_slide = curr_slide+1;
		var c = curr_slide;
		if(next_slide > slide_num) next_slide = 1;
		$("#slide_"+curr_slide).fadeOut(foTime,function(){change_z(c,next_slide);});	
		curr_slide = next_slide;
	}
	
	function change_z(os,ts){
		var ns = ts+1;
		if(ns > slide_num) ns = 1;
		$("#slide_"+os).css({zIndex:2});
		$("#slide_"+ts).css({zIndex:slide_num+2});
		$("#slide_"+ns).css({zIndex:slide_num+1});
		$("#slide_"+os).css({display:"block"});	
	}