Hello guys,

I am using Javascript TINYSlideshow script and I want to add it some extra functionality. As you can see on site http://nabyteksdusi.cz/test.php when you click on image, it sends you on site with enlarged one. If you want to get back with back arrow, the gallery is starting on first image. And I want to extend the Slideshow function of remembering the image id (?), so when you get back, you see an image where you ended. I think that a getCookie function is needed, but I am pretty new to using javascript, so I will appreciate any kind of help to make it work.
Here is the javascript code:

Code:
var SKRIPT={};
function $(i){return document.getElementById(i)}
function $$(e,p){p=p||document; return p.getElementsByTagName(e)}
SKRIPT.slideshow=function(n){
   this.infoSpeed=this.imgSpeed=this.speed=2;
   this.thumbOpacity=this.navHover=100;
   this.navOpacity=50;
   this.letterbox='#000';  
   this.persist=true;
   this.n=n;
   this.c=0;
   this.a=[]
};
SKRIPT.slideshow.prototype={
   init:function(s,z,b,f,q){
      s=$(s);
      var m=$$('li',s), i=0, w=0;
      this.l=m.length;
      this.q=$(q);
      this.f=$(z);
      this.r=$(this.info);
      this.o=parseInt(SKRIPT.style.val(z,'width'));
      if(this.thumbs){
         var u=$(this.left), r=$(this.right);
         u.onmouseover=new Function('SKRIPT.scroll.init("'+this.thumbs+'",-1,'+this.scrollSpeed+')');
         u.onmouseout=r.onmouseout=new Function('SKRIPT.scroll.cl("'+this.thumbs+'")');
         r.onmouseover=new Function('SKRIPT.scroll.init("'+this.thumbs+'",1,'+this.scrollSpeed+')');
         this.p=$(this.thumbs)
      }
      for(i;i<this.l;i++){
         this.a[i]={};
         var h=m[i], a=this.a[i];    
         a.l=$$('a',h)[0]?$$('a',h)[0].href:'';       
         a.p=$$('span',h)[0].innerHTML; 
         if(this.thumbs){
            var g=$$('img',h)[0];
            this.p.appendChild(g);
            w+=parseInt(g.offsetWidth);
            if(i!=this.l-1){
               g.style.marginRight=this.spacing+'px';
               w+=this.spacing;
            }
            this.p.style.width=w+'px';
            g.style.opacity=this.thumbOpacity/100;
            g.style.filter='alpha(opacity='+this.thumbOpacity+')';
            g.onmouseover=new Function('SKRIPT.alpha.set(this,100,5)');
            g.onmouseout=new Function('SKRIPT.alpha.set(this,'+this.thumbOpacity+',5)');
            g.onclick=new Function(this.n+'.pr('+i+',1)')
         }
      }
      if(b&&f){
         b=$(b);
         f=$(f);
         b.style.opacity=f.style.opacity=this.navOpacity/100;
         b.style.filter=f.style.filter='alpha(opacity='+this.navOpacity+')';
         b.onmouseover=f.onmouseover=new Function('SKRIPT.alpha.set(this,'+this.navHover+',5)');
         b.onmouseout=f.onmouseout=new Function('SKRIPT.alpha.set(this,'+this.navOpacity+',5)');
         b.onclick=new Function(this.n+'.mv(-1,1)');
         f.onclick=new Function(this.n+'.mv(1,1)')
      }
      this.auto?this.is(0,0):this.is(0,1)
   },
   mv:function(d,c){
      var t=this.c+d;
      this.c=t=t<0?this.l-1:t>this.l-1?0:t;
      this.pr(t,c)
   },
   pr:function(t,c){
      clearTimeout(this.lt);
      if(c){
         clearTimeout(this.at)
      }
      this.c=t;
      this.is(t,c)
   },
   is:function(s,c){
      if(this.info){
         SKRIPT.height.set(this.r,1,this.infoSpeed/2,-1)
      }
      var i=new Image();
      i.style.opacity=0;
      i.style.filter='alpha(opacity=0)';
      this.i=i;
      i.onload=new Function(this.n+'.le('+s+','+c+')');
      i.src=this.a[s].p;
      if(this.thumbs){
         var a=$$('img',this.p), l=a.length, x=0;
         for(x;x<l;x++){
            a[x].style.borderColor=x!=s?'':this.active
         }
      }
   },
   le:function(s,c){
      this.f.appendChild(this.i);
      var w=this.o-parseInt(this.i.offsetWidth);
      if(w>0){
         var l=Math.floor(w/2);
         this.i.style.borderLeft=l+'px solid '+this.letterbox;
         this.i.style.borderRight=(w-l)+'px solid '+this.letterbox
      }
      SKRIPT.alpha.set(this.i,100,this.imgSpeed);
      var n=new Function(this.n+'.nf('+s+')');
      this.lt=setTimeout(n,this.imgSpeed*100);
      if(!c){
         this.at=setTimeout(new Function(this.n+'.mv(1,0)'),this.speed*1000)
      }
      if(this.a[s].l!=''){        
         this.q.onclick=new Function('window.location="'+this.a[s].l+'"');
         this.q.onmouseover=new Function('this.className="'+this.link+'"');
         this.q.onmouseout=new Function('this.className=""');
         this.q.style.cursor='pointer'
      }else{
         this.q.onclick=this.q.onmouseover=null;
         this.q.style.cursor='default'
      }
      var m=$$('img',this.f);
      if(m.length>2){
         this.f.removeChild(m[0])
      }
   },
   nf:function(s){
      if(this.info){
         s=this.a[s];
         this.r.style.height='auto';
         var h=parseInt(this.r.offsetHeight);
         this.r.style.height=0;
         SKRIPT.height.set(this.r,h,this.infoSpeed,0)
      }
   }
};
SKRIPT.height=function(){
   return{
      set:function(e,h,s,d){
         e=typeof e=='object'?e:$(e); var oh=e.offsetHeight, ho=e.style.height||SKRIPT.style.val(e,'height');
         ho=oh-parseInt(ho); var hd=oh-ho>h?-1:1; clearInterval(e.si); e.si=setInterval(function(){SKRIPT.height.tw(e,h,ho,hd,s)},20)
      },
      tw:function(e,h,ho,hd,s){
         var oh=e.offsetHeight-ho;
         if(oh==h){clearInterval(e.si)}else{if(oh!=h){e.style.height=oh+(Math.ceil(Math.abs(h-oh)/s)*hd)+'px'}}
      }
   }
}();
SKRIPT.alpha=function(){
   return{
      set:function(e,a,s){
         e=typeof e=='object'?e:$(e); var o=e.style.opacity||SKRIPT.style.val(e,'opacity'),
         d=a>o*100?1:-1; e.style.opacity=o; clearInterval(e.ai); e.ai=setInterval(function(){SKRIPT.alpha.tw(e,a,d,s)},20)
      },
      tw:function(e,a,d,s){
         var o=Math.round(e.style.opacity*100);
         if(o==a){clearInterval(e.ai)}else{var n=o+Math.ceil(Math.abs(a-o)/s)*d; e.style.opacity=n/100; e.style.filter='alpha(opacity='+n+')'}
      }
   }
}();
SKRIPT.style=function(){return{val:function(e,p){e=typeof e=='object'?e:$(e); return e.currentStyle?e.currentStyle[p]:document.defaultView.getComputedStyle(e,null).getPropertyValue(p)}}}();
I do not have much time now to gain more javascript experiences and I really need to have this slideshow done in a few days. I tried to programme it, but unsuccessfully. I am sorry and thanks in advance for your help!
M.