Image slide show source code based on jquery_jquery

//Picture slide show
$(function() {
var imgPro = {
imgWidth : 626, //Picture width
imgConLength : 0, //Total length of picture
index : 0, //Navigation lock index
count : 0, // Number of pictures
left : 0, //Absolute positioning left
pre : -1, //Previous picture index
curr : 0, //Current picture index
next : 1, //Next Image index
direction: 1, //Auto play direction
interTime: 3000//Interval time
}
addImgAlt(imgPro.curr);
imgPro.count = $('# banner .list a img').length;
imgPro.imgConLength = imgPro.imgWidth * imgPro.count;
imgPro.left = parseInt($('#box .list ul').css("left" ));
//Play timer
var t = setInterval(imgPlay, imgPro.interTime);
$('#box .arrowl img, #box .arrowr img,#banner .list a, #box .count li,#box p').hover(function() {
clearInterval(t);
}, function() {
t = setInterval(imgPlay, imgPro.interTime);
});
// Automatically play pictures
function imgPlay() {
if ((imgPro.next != imgPro.count && imgPro.direction == 1) || (imgPro.pre = = -1 && imgPro.direction == -1)) {
imgPro.direction = 1;
toNext();
} else {
imgPro.direction = -1;
toLast ();
}

}

//Click left direction
$('#box .arrowl img').click(function() {
if ( imgPro.curr != 0) {
toLast();
}
});
//Click the right direction
$('#box .arrowr img').click(function () {
if (imgPro.next != imgPro.count) {
toNext();
}
});
//Click the navigation to play
$('# box .count li').click(function() {
imgPro.index = $('#box .count li').index(this);
if (imgPro.curr != imgPro.index) {
imgPro.left = (imgPro.curr - imgPro.index) * imgPro.imgWidth;
addImgAlt(imgPro.index);
play();
$('#box .count li ').eq(imgPro.curr).removeClass('current').end().eq(imgPro.index).addClass('current');
imgPro.curr = imgPro.index;
imgPro .pre = imgPro.index - 1;
imgPro.next = imgPro.index 1;
}
});
//Play
function play() {
$( '#box .list ul').css({
'opacity' : '0.5'
}).animate({
'left' : imgPro.left "px",
'opacity ' : '1'
}, 'slow');
}

//Add picture description information
function addImgAlt(index) {
$("#box p" ).text($("#banner .list a img").eq(index).attr("alt"));
}

//Previous
function toLast( ) {
imgPro.left = imgPro.imgWidth;
addImgAlt(imgPro.pre);
play();
$('#box .count li').eq(imgPro.curr) .removeClass('current').end().eq(imgPro.pre).addClass('current');
imgPro.pre--;
imgPro.curr--;
imgPro.next --;
}

//Next
function toNext() {
imgPro.left -= imgPro.imgWidth;
addImgAlt(imgPro.next);
play();
$('#box .count li').eq(imgPro.curr).removeClass('current').end().eq(imgPro.next).addClass('current') ;
imgPro.pre ;
imgPro.curr ;
imgPro.next ;
}

});