var timer = null;
var offset = 5000;
var index = -1;
var target = ["xixi-01","xixi-02","xixi-03","xixi-04","xixi-05","xixi-06","xixi-07","xixi-08"];

//´óͼ½»ÌæÂÖ»»
function slideImage(i){
    var id = 'image_'+ target[i];
    $('#'+ id)
        .animate({opacity: 1}, 800).show()
        .siblings(':visible')
        .animate({opacity: 0}, 800).hide();

}
//bind thumb a
function hookThumb(){    
    $('#thumbs li a')
        .bind('click', function(){
            if (timer) {
                clearTimeout(timer);
            }                
            var id = this.id;            
            index = getIndex(id.substr(6));
            rechange(index);
            slideImage(index); 
            timer = window.setTimeout(auto, offset);  
            this.blur();            
            return false;
        });
}

//get index

function getIndex(v){
    for(var i=0; i < target.length; i++){
        if (target[i] == v) return i;
    }
}

function rechange(loop){
    var id = 'thumb_'+ target[loop];
    $('#thumbs li a.current').removeClass('current');
    $('#'+ id).addClass('current');
}

function auto(){
    index++;
    if (index > 7){
        index = 0;
    }
    rechange(index);
    slideImage(index);
    timer = window.setTimeout(auto, offset);
}

$(function(){    
    auto();  
    hookThumb();     
});