var o_id =1;
       stan = new Array();
       e =new Array();
       e[1] = document.getElementsByName('zdj1');
       e[2] = document.getElementsByName('zdj2');
       e[3] = document.getElementsByName('zdj3');
       e[4] = document.getElementsByName('zdj4');
       function obrazki()
       {       

              
                     o_id++;
              if(o_id==5)
              {
                     o_id=1;
              }
                    //       stan[1]="hidden";
                           stan[2]="hidden";
                           stan[3]="hidden";
                           stan[4]="hidden";
                           stan[o_id]="visible";

       
       for(var x=1;x<5;x++)
       {
              for(var i=0;i<e[x].length;i++)
              {
                     e[x][i].style.visibility = stan[x];
              }
       }                     

       
}  setInterval("obrazki()", 5000);