var i=-1; //第i+1个tab开始
var offset = 2500; //轮换时间
var timer = null;
function autoroll(){
	n = $(".branch dd").length-1;
	i++;
	if(i > n){
		i = 0;
	}
	slide(i);
	timer = window.setTimeout(autoroll, offset);
}
function slide(i){
	//$(".branch dd").eq(i).addClass("").siblings().removeClass("");
	$(".branch dt span").eq(i).css("display","block").siblings(".branch dt span").css("display","none");
}
function hookThumb(){    
	$(".branch dd").hover(function () {
		if (timer) {
			clearTimeout(timer);
		i = $(this).prevAll().length;
		 slide(i); 
		}
	},function () {
  		timer = window.setTimeout(autoroll, offset);  
		this.blur();            
		return false;
	}); 
}
$(document).ready(function(){
    /*
	
	autoroll();
	hookThumb();
    */
});