var global_count_pict = 0;
var global_z_count = 0;
var global_x_count = 0;

function ChangePict()
{
    var pict = document.getElementById("copyright-img");
    
    var pictNum = pict.className.replace("pos-", "");

    
    if(pictNum == "z")
    {
        if(global_z_count == 1)
            pictNum = 0;
        else
            global_z_count = 1;
    }
    
    if(pictNum == "x")
    {
        if(global_x_count == 1)
            pictNum = 0;
        else
            global_x_count = 1;
    }
    
    if(pictNum != "z" && pictNum != "x" && pictNum != "c")
    {
        pictNum = Math.floor(pictNum);
        pictNum++;
        
        if(pictNum > 5)
            pictNum = 1;
    }    
    
    if(global_count_pict == 6)
        pictNum = "z";
        
    if(global_count_pict == 12)
        pictNum = "x";
        
    if(global_count_pict == 18)
        pictNum = "c";
        
    var newClass = "pos-"+pictNum;

    pict.className = newClass; 
    
    global_count_pict++;
    
    
}