function on_menu(idecko){
	var links = document.getElementById(idecko);
	links.style.background = 'url(./img/selected.jpg) no-repeat left top';
	links.style.color = 'white';
	links.style.fontWeight = 'bold';
	links.style.paddingLeft = '25px';
	}
	
	function off_menu(idecko){
	var links = document.getElementById(idecko);
	links.style.backgroundImage = 'none';
	links.style.backgroundColor = '#C8DDF7';
	links.style.color = 'black';
	links.style.fontWeight = 'normal';
	links.style.paddingLeft = '15px';
	}
	
	function jdi(kamzpatky){
	window.location.replace(kamzpatky); 
	}
	
	
	 var k=0;
 	var zmenaa;
	var zmenab;
	
	
function haluz(hdata){
	
	 if(hdata=="yes"){
	 k++;
	 ko = k % 3;
	 
	 zmenaa = ko+1;
	 zmenab = ko;
	 if(zmenaa==4) zmenaa=1
  	 if(zmenab==0) zmenab=3
	 
	  change_image('imgleft'+zmenaa,'imgleft'+zmenab, 150);
	 }
	  setTimeout('haluz("yes");', 12000);
}
 
 
function change_image(numa, numb, speed){
var i;
var y;
 
for (i=0;i<11;i++){
 
	setTimeout('setOpacity('+i+', '+numa+', '+numb+')', speed*i); 
}
	
for (y=0;y<11;y++){
	 setTimeout('downOpacity('+y+', '+numa+', '+numb+')', speed*y); 
}

 return false;
}

function setOpacity(value, numa, numb)
{
   	 numa.style.opacity = value/10;
	 numa.style.filter = 'alpha(opacity=' + value*10 + ')';
	 if(value==1) numa.style.display = "block";	 
}

function downOpacity(valueb, numa, numb)
{	
	  if(valueb==10) numb.style.display = "none";	
	 numb.style.opacity = 1 - (valueb/10);
	 numb.style.filter = 'alpha(opacity=' + (100 - valueb*10) + ')';
	   
}