function cerne_pozadi() {
	var pozadi = document.createElement('div');
	pozadi.id = 'ZCV_pozadi';
	pozadi.style.position = 'absolute';
	pozadi.style.left = '0px';
	pozadi.style.top = '0px';
	pozadi.style.filter = 'alpha(opacity=70)';
	pozadi.style.MozOpacity = '0.7';
	pozadi.style.opacity = '0.7';
	pozadi.style.backgroundColor = 'black';
	pozadi.style.width = '100%';
	pozadi.style.height = ZCV_rozmery()[1]+'px';
	pozadi.style.zIndex = 9;
	document.body.appendChild(pozadi);
}
		
function ukazat_info_box(text, loader) {
	cerne_pozadi();
	document.getElementById('info_box').style.display = 'block';
	document.getElementById('info_box').style.top = ZCV_scroll() + 150 + 'px';
	document.getElementById('info_box').innerHTML ='<div style="padding:20px;"><strong>' +text+ '<\/strong><\/div>';			
	
	switch (loader) {
		case 0:		document.getElementById('info_box').innerHTML+='<div style="text-align:right; background:#FD911B; padding-top:5px;"><input type="button" onclick="zavrit_info_box()" id="info_box_OK" value="OK"><\/div>';
					document.getElementById('info_box_OK').focus();
					break;
	
		case 1:		document.getElementById('info_box').innerHTML+='<div style="text-align:right; background:#FD911B; padding-top:5px;"><img src="img/loader.gif"><\/div>';
					break;
					
		case 2:		document.getElementById('info_box').innerHTML+='<div style="text-align:right; background:#FD911B; padding-top:5px;"><input type="button" onclick="zavrit_info_box()" id="info_box_OK" value="Close"><\/div>';
					document.getElementById('info_box_OK').focus();
					break;
	}
}
		
function zavrit_info_box() {
	document.getElementById('ZCV_pozadi').parentNode.removeChild(document.getElementById('ZCV_pozadi'));
	document.getElementById('info_box').style.display = 'none';
}