The jQuery plug-in displays the divs under this in turn_jquery

/*
Display the divs under this in turn
dname specifies the element that needs to perform this action. If dname is not specified, all sub-elements will be defaulted;
tname specifies the activation element corresponding to dname;
speed displays the switching speed;
effe displays the effect ;
*/
(function(){
.fn.w_picSwap=function(dname,tname,speed,effe){
speed=speed || 2000;
dname=dname | | "";
tname=tname || "";
effe=effe || 1;
return this.each(function(){
var myTime;
var obj=( this);
var objs=(this).find(dname);
var objnl=(this).find(tname).not(dname);
var len2=objnl.length;
var len=objs.length;
if(len<2){ return;}
var si=0;
var old=0;
objs.not(':first'). css('opacity',0);
function showImg(){
old=si;si=(si==(len-1))?0:si 1;
effect(objs.eq (old),objs.eq(si));
if(len2){
objnl.eq(old).removeClass("on");
objnl.eq(si).addClass(" on");
}
};
function effect(o,n){
switch(effe){
case 1:
o.stop().animate({ opacity:0});
n.stop().animate({opacity:1});
break;
case 2:
var toff=o.position();
n.stop().css("top",toff.top o.outerHeight()).animate({top:toff.top,opacity:1},200);
o.stop().animate( {top:toff.top-o.outerHeight(),opacity:0});
break;
}
}
function begin(){
myTime = setInterval(showImg,speed );
};
objnl.mouseover(function(){
si=objnl.index(this);
showImg();
});
//Slide in Stop the animation and slide out to start the animation.
obj.hover(function(){
if(myTime){clearInterval(myTime);}
},function(){
begin();
});
begin();
});
};
})(jQuery);