$(document).ready(function(){
    lastBlock = $("#main_anim01");
    maxWidth = 550;
    minWidth = 105;	
		
    $("#main_anim ul li a").hover(
      function(){
        $(lastBlock).animate({width: minWidth+"px"}, { queue:false, duration:605 });
				$(this).animate({width: maxWidth+"px"}, { queue:false, duration:600});
				lastBlock = this;
				
      }
    );
});