$(document).ready(function(){
	var page;
	var obj_num;
	var gotoTime;
	LinkShow();
}); 

function LinkShow(){
	obj_num=$("#link_show a img").length;
	$("#link_show").css("width",126*obj_num+4+"px");
	page=1;
	gotoTime=setTimeout("gotoNext()",4000);
	goto(page);
	
	$(".link_btn_pre").click(function(){
		if(page<2){
			page=1;
		}else{
			page--;
		}
		goto(page);
	});
	$(".link_btn_next").click(function(){
		if(page>obj_num-1){
			page=obj_num;
		}else{
			page++;
		}
		goto(page);
		
	});
}

function goto(num){
	page=num;
	var left_num = -126*(num-1)+"px";
	$("#link_show").animate({
		marginLeft:left_num
	},500);
	clearTimeout(gotoTime);
	gotoTime=setTimeout("gotoNext()",4000);
}

function gotoNext(){
	if(page>obj_num-1){
		page=1;
	}else{
		page++;
	}
	goto(page);
}