$(document).ready(function(){
 lastBlock = $("#a1");
 maxWidth = 420;
 minWidth = 220;

 $("#partnerzy_slide ul li a").hover(
 function(){
 $(lastBlock).animate({width: minWidth+"px"}, { queue:false, duration:400 });
 $(this).animate({width: maxWidth+"px"}, { queue:false, duration:400});
 currentBlock = this;
 lastBlock = this;
 }
 );
 });