var hoverdiv = "div.hover";
var hover_speed = 200;

$(document).ready(function(){

// Preloading obrazków hover
    
$("a#soc_fb").children(hoverdiv).css("background-image", "url(graphics/soc_fb.png)"); 
$("a#soc_tw").children(hoverdiv).css("background-image", "url(graphics/soc_tw.png)"); 
$("a#soc_yt").children(hoverdiv).css("background-image", "url(graphics/soc_yt.png)"); 

// Zdarzenia hover
    
    $("a#soc_fb")
    .mouseenter(function(){ $(this).children(hoverdiv).stop(true, true).fadeIn(hover_speed); })
    .mouseleave(function(){ $(this).children(hoverdiv).stop(true, true).fadeOut(hover_speed); });
    
    $("a#soc_tw")
    .mouseenter(function(){ $(this).children(hoverdiv).stop(true, true).fadeIn(hover_speed); })
    .mouseleave(function(){ $(this).children(hoverdiv).stop(true, true).fadeOut(hover_speed); });
    
    $("a#soc_yt")
    .mouseenter(function(){ $(this).children(hoverdiv).stop(true, true).fadeIn(hover_speed); })
    .mouseleave(function(){ $(this).children(hoverdiv).stop(true, true).fadeOut(hover_speed); });
});