var YD = YAHOO.util.Dom, YE = YAHOO.util.Event;
	var url_prefix = "http://www.symbio.com/";
	(function(){
	var slide_data = slideString;
	var slide_id = 0,
		slide_sum = 4,
		slide_ing = false,
		slide_time = null,
		slide_el = YD.get("slide"),
		slide_img_els = YD.getElementsByClassName("slide_img", "DIV", slide_el)[0].getElementsByTagName("IMG"),
		slide_list_els = YD.getElementsByClassName("slide_list", "DIV", slide_el)[0].getElementsByTagName("LI"),
		slide_loading_els = YD.getElementsByClassName("slide_loading", "IMG", slide_el),
		slide_prev_el = YD.getElementsByClassName("slide_prev", "A", slide_el)[0],
		slide_next_el = YD.getElementsByClassName("slide_next", "A", slide_el)[0];
	
	for(i=0; i<slide_sum; i++){
		(function(i){
			slide_img_els[i].src = slide_data[i].img;
			slide_img_els[i].onload = function(){
				if(i==0) YD.setStyle(slide_img_els[0], "display", "block");
				YD.setStyle(slide_loading_els[i], "display", "none");
			};
		})(i)	
	}
	
	slide_switch = function(id){
		if(id == slide_id) return;
		if(slide_ing === true) return;
		clearTimeout(slide_time);
		slide_ing = true;
		slide_id = id;
		YD.setStyle(slide_img_els[id], "opacity", 0);
		YD.setStyle(slide_img_els[id], "z-index", 5);
		YD.setStyle(slide_img_els[id], "display", "block");
		for(i=0; i<slide_sum; i++){
			YD.removeClass(slide_list_els[i], "on");
		}
		YD.addClass(slide_list_els[id], "on");
		var anim = new YAHOO.util.Anim(slide_img_els[id], {"opacity":{to:1}});
		anim.animate();
		anim.onComplete.subscribe(
			function(){
				for(i=0; i<slide_sum; i++){
					if(i != id) YD.setStyle(slide_img_els[i], "z-index", 1);
				}
				YD.setStyle(slide_img_els[id], "z-index", 4);
				slide_ing = false;
			}
		);
		slide_time = setTimeout(function(){
			var temp_id = (slide_id+1 >= slide_sum) ? 0 : slide_id+1;
			slide_switch(temp_id);
		},6000);
	}
	
	for(i=0; i<slide_sum; i++){
		(function(i){
			YE.on(slide_list_els[i], "click", function(){
				slide_switch(i);
			});
		})(i)
	}
	
	YE.on(slide_prev_el, "click", function(e){
		YE.stopEvent(e);
		var id = (slide_id == 0) ? slide_sum-1 : slide_id-1;
		slide_switch(id);
	});
	YE.on(slide_next_el, "click", function(e){
		YE.stopEvent(e);
		var id = (slide_id == slide_sum-1) ? 0 : slide_id+1;
		slide_switch(id);
	});
	slide_time = setTimeout(function(){slide_switch(1);}, 6000);
	})();