function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document;
  if(d.images)
  {
    if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments;
	for(i=0; i<a.length; i++)
      if (a[i].indexOf("#")!=0)
	  {
        d.MM_p[j]=new Image;
		d.MM_p[j++].src=a[i];
	  }
  }
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;
  if(!d) d=document;
  if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document;
	n=n.substring(0,p);
  }
  if(!(x=d[n])&&d.all) x=d.all[n];
  for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n);
  return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function opChanged(obj)
{
	btn = MM_findObj("submitBtn");
	btn.src = (obj.value == "buy" ? "images/button_kolik_zaplatim.png" : "images/button_kolik_usetrim.png");
	btn.alt = (obj.value == "buy" ? "Kolik zaplatím?" : "Kolik ušetrím?");
}

function submitBtnOver(obj)
{
	op = MM_findObj("operation");
	if (op && op.value == "buy")
	{
		MM_swapImage('submitBtn','','images/button_kolik_zaplatim_h.png');
		obj.oSrc = 'images/button_kolik_zaplatim.png';
	}
	else
	{
		MM_swapImage('submitBtn','','images/button_kolik_usetrim_h.png');
		obj.oSrc = 'images/button_kolik_usetrim.png';
	}		
}

function submitBtnOut()
{
	MM_swapImgRestore();
}