function opacity(id, opacStart, opacEnd, millisec) { 
    //speed for each frame 
    var speed = Math.round(millisec / 100); 
    var timer = 0; 

    //determine the direction for the blending, if start and end are the same nothing happens 
    if(opacStart > opacEnd) { 
        for(i = opacStart; i >= opacEnd; i--) { 
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
        } 
    } else if(opacStart < opacEnd) { 
        for(i = opacStart; i <= opacEnd; i++) 
            { 
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed)); 
            timer++; 
        } 
    } 
} 

//change the opacity for different browsers 
function changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
}

function blendimage(divid, imageid, imagefile, millisec) { 
    var speed = Math.round(millisec / 100); 
    var timer = 0; 
     
    //set the current image as background 
    document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")"; 
     
    //make image transparent 
    changeOpac(0, imageid); 
     
    //make new image 
    document.getElementById(imageid).src = imagefile; 

    //fade in image 
    for(i = 0; i <= 100; i++) { 
        setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed)); 
        timer++; 
    } 
}

function zvyrazniBytn(p, b, cur){
	//cur = 'pointer';
	if(p==0 & b=="B"){
			document.getElementById('bytBx').src='obr/patra/'+p+'NPBBa.jpg';
			document.getElementById('bytB').src='obr/patra/'+p+'NP'+b+'a.jpg';
			document.body.style.cursor = cur;
	}else if(p==0 & b=="A"){
			document.getElementById('byt'+b).src='obr/patra/'+p+'NP'+b+'a.jpg';
			document.getElementById('bytBx').src='obr/patra/'+p+'NPAAa.jpg';
			document.body.style.cursor = cur;
	}else	document.getElementById('byt'+b).src='obr/patra/'+p+'NP'+b+'a.jpg';
}

function zrusZvyraznenin(p, b){
	if(p==0 & b=="B"){
			document.getElementById('bytB').src='obr/patra/'+p+'NP'+b+'.jpg';
			document.getElementById('bytBx').src='obr/patra/'+p+'NP'+b+'x.jpg';
	}else if(p==0 & b=="A"){
			document.getElementById('byt'+b).src='obr/patra/'+p+'NP'+b+'.jpg';
			document.getElementById('bytBx').src='obr/patra/'+p+'NPAAx.jpg';
	}else	document.getElementById('byt'+b).src='obr/patra/'+p+'NP'+b+'.jpg';
	document.body.style.cursor = 'default';
}

function zmenPatro(p){
	document.getElementById('dum-img').src='obr/'+p+'np.jpg'; 
	document.getElementById('podlazi').innerHTML=document.getElementById('podlazi'+p).innerHTML;
}

function showblock(id){
	//alert(id);
	if(document.getElementById(id).style.display == 'none') document.getElementById(id).style.display = 'block';
	else document.getElementById(id).style.display = 'none';
}