var pict = new Array();

 if (document.images) {
    pict[1] = "images/1.png";
    pict[2] = "images/2.png";
    pict[3] = "images/3.png";
    pict[4] = "images/5.png";
    pict[5] = "images/4.png";
    pict[6] = "images/6.png";
    pict[7] = "images/7.png";
    pict[8] = "images/8.png";
    pict[9] = "images/9.png";
    pict[10]= "images/10.png";
 }


function SwitchBg(i){
  var id = 'uka';

  if (i == 2 || i == 3 || i == 4 || i == 5 )
   document.getElementById(id).style.background = "url('"+pict[i]+"') no-repeat top left";
  else
   document.getElementById(id).style.background = "none";
}