function openWindowPICTURE(pic)
{
 window.open(pic, "img",'toolbar=0,location=yes,scrollbars=yes, resizable=yes, width=650,height=650');
}
function change_img()
{
  document.getElementById('obrazek_1').style.backgroundColor = '#ccccccc';
}
function changeColor(id, color) {
element = document.getelementbyid(id);
event.cancelBubble = true;
oldColor = element.currentStyle.background;
element.style.background = color;
} 

function mouseover(idcko,idcko1, barva, zdroj)
{
  if(document.getElementById(idcko).style.display=='block') 
  {
    document.getElementById(idcko).style.display='none';
  }
  else
  {
    document.getElementById(idcko).style.display='block';
  }
  document.getElementById(idcko1).src=zdroj;
}