var start = 1;
var end = 8;



function ScDown()
{
 var count = document.getElementById('allImages').value;  
 var nu = 1;
    
   if(end<count)
   {
        start = start+2;
        end = end+2;

        while(nu!=count+1)
        {
           if(nu>=start && nu<=end)
           {
                if(document.getElementById('slide'+nu)){
                document.getElementById('slide'+nu).style.display = 'block';
                }
           }else
           {
                if(document.getElementById('slide'+nu)){
                document.getElementById('slide'+nu).style.display = 'none';
                }
           }
           nu++;
        }
   }
  
}

function ScUp()
{
    var count = document.getElementById('allImages').value;
   var nu = 1;
   if(start!=1)
   {
        start = start-2;
        end = end-2;

        while(nu!=count+1)
        {
           if(nu>=start && nu<=end)
           {
                if(document.getElementById('slide'+nu)){
                document.getElementById('slide'+nu).style.display = 'block';
                }
           }else
           {
                if(document.getElementById('slide'+nu)){
                document.getElementById('slide'+nu).style.display = 'none';
                }
           }
           nu++;
        }
   }
  
}

function showImg(id)
{
    var img = document.getElementById(id).value;
    document.getElementById('showId').value = id;
    document.getElementById('show').src = img;
}

function prevII()
{
    var count = document.getElementById('allImages').value;
    var id = document.getElementById('showId').value;
    if (id ==''){id = 'img1';}
    id = id.substr(3);
    
    if (id==1){id=1;}else{id--;}
    id = 'img'+id;
    var img = document.getElementById(id).value;
    document.getElementById('showId').value = id;
    document.getElementById('show').src = img;
}   
function nextII()
{
    var count = document.getElementById('allImages').value;
    var id = document.getElementById('showId').value;
    
    if (id ==''){id = 'img1';}
    id = id.substr(3);
    if (id==count){id=count;} else{id++;}
    
    id = 'img'+id;
    var img = document.getElementById(id).value;
    document.getElementById('showId').value = id;
    document.getElementById('show').src = img;
}
function downloadII()
{
    var id = document.getElementById('showId').value;
    if (id=='') {id = 'img1';}
    var img = document.getElementById(id).value;
    location = img;
    
}