function policz(zdarzenie) {
  zdarzenie = (zdarzenie)?zdarzenie:((window.event)?event:null);

  x=zdarzenie.clientX;
  y=zdarzenie.clientY;


  if (x>236) {
             document.getElementById("Zoom").style.display="none";
             document.form1.style.display="none";
             //document.form2.style.display="";
             document.getElementById("Obraz").style.display="";
             } else {
                    document.getElementById("Zoom").style.display="";
                    document.form1.style.display="";
                    //document.form2.style.display="none";
                    if (y<320) {
                    y=y*2 ;
                    document.getElementById("zoomobrazu").src=document.getElementById("pierwszy").src;
                    document.getElementById("Zoom").style.top=-y+50;
                    document.getElementById("Zoom").style.left=500-200;
                    document.getElementById("Zoom").style.clip="rect("+(y)+" "+(0)+" "+(y+400)+" 800 )";
                               }
                    else
                               {
                               document.getElementById("zoomobrazu").src=document.getElementById("drugi").src;
                               y=(y-320)*2;
                               document.getElementById("Zoom").style.top=-y+50;
                               document.getElementById("Zoom").style.left=500-200;
                               document.getElementById("Zoom").style.clip="rect("+(y)+" "+(0)+" "+(y+400)+" 800 )";
                               }
                    }
    
}

if (navigator.appName=="Microsoft Internet Explorer") {
  document.onmousemove = policz;
} else {
  window.onmousemove = policz;
}