function changeSrc(el,img){
   if(el!=null){
      el.src=img;
   }
}

function td_kolor(td,kolor){
  if(td!=null){
      td.style.backgroundColor=kolor;
  }
}


function preloader(){

   var i = 0;

   imageObj = new Image();

   images = new Array();
   images[0]="images/lang_en_over.gif";
   images[1]="images/lang_pl_over.gif";
   images[2]="images/lang_de_over.gif";
   images[3]="images/lang_fr_over.gif";
   images[4]="images/wiecej_over.gif";
   images[5]="images/zobacz_wiecej_over.gif";   

   for(i=0; i<=5; i++){
      imageObj.src=images[i];
   }
}