function f_lupa() {
// 	if (obrazek!='') {
		obj=document.getElementById('id_from');
		obr=document.getElementById('lupa_img');
		obrdiv=document.getElementById('lupa_div');
		posx=najdiX(obj);
		posy=najdiY(obj);

		obrdiv.style.left=(posx-531)+'px';
		obrdiv.style.left=220+'px';
		obrdiv.style.top=(posy-416)+'px';
/*		obr.style.width='140px';
		obr.style.height='100px';*/
		obrdiv.style.display='block';
// 	}
}

function f_lupa_hide() {
	ready=true;
	obrdiv=document.getElementById('lupa_div');
	obrdiv.style.display='none';
}

function najdiX(obj)
{
	var curleft = 0;
	if(obj.offsetParent)
	while(1) 
	{
		curleft += obj.offsetLeft;
		if(!obj.offsetParent)
		break;
		obj = obj.offsetParent;
	}
	else if(obj.x)
	curleft += obj.x;
	return curleft;
}

function najdiY(obj)
{
	var curtop = 0;
	if(obj.offsetParent)
	while(1)
	{
		curtop += obj.offsetTop;
		if(!obj.offsetParent)
		break;
		obj = obj.offsetParent;
	}
	else if(obj.y)
	curtop += obj.y;
	return curtop;
}

function show_cart_popup(nazev,pocet,celkem,id_item) {
    cart_obj_nazev = document.getElementById('cart_popup_nazev');
    cart_obj_nazev.innerHTML = nazev; 
    cart_obj_pocet = document.getElementById('cart_popup_pocet');
    cart_obj_pocet.innerHTML = pocet; 
    cart_obj_celkem = document.getElementById('cart_popup_celkem');
    cart_obj_celkem.innerHTML = celkem; 

    obj=document.getElementById("list_tlac_" + id_item);
    posx=najdiX(obj);
    posy=najdiY(obj);

    cart_obj = document.getElementById('cart_popup');
//     cart_obj.style.left=(posx-200)+'px';
    cart_obj.style.left=727+'px';
    cart_obj.style.top=(posy-110)+'px';
    cart_obj.style.display = 'block';


}
function cart_popup_hide() {
    cart_obj = document.getElementById('cart_popup');
    cart_obj.style.display = 'none';
}