function ShowSlide()
{
	document.getElementById('left-slide').style.display="block";
	document.getElementById('right-slide').style.display="block";
}
function CloseTip(closeimg)
{	closeimg.parentNode.parentNode.style.display='none'
	document.getElementById('overlay').style.display='none';
	closebt=null;
}
function ShowTip(id)
{	closebt=id+"_closebt";
	document.getElementById('overlay').style.display='block';
	document.getElementById(id).style.display='block';
}
function ConfirmBack()
{	return confirm('Opravdu si přejete návrat na FLASH VIDEO prezentaci?');

}

function checkDate(datum)
{	var re=/[./]/; 
	aDatum=datum.split(re,3);
	if (aDatum.length==3)
	{	dd=aDatum[0];
		mm=aDatum[1];
		yyyy=aDatum[2];
		if (dd=="" || mm=="" || yyyy=="" || yyyy.length!=4 || Number(yyyy)<1900 || Number(yyyy)>2100)
			return false;
		else
		{	datum=new Date(yyyy,Number(mm)-1,dd)
			if (isNaN(datum))
				return false;
			else
			{	var OldDay=dd
				if (dd!=datum.getDate()) return false;
			}
		}
	} else return false;
	return true;
}

function checkDate2(date,when)
{	re = /\./g;
	re1 = '^[0-9]{1,2}\/[0-9]{1,2}\/[0-9]{2,4}$';
	datum=date.replace(re,"/");
	if (datum.match(re1))
	{	var aDatum=datum.split('/');
		den=Number(aDatum[0]);
		mesic=Number(aDatum[1])-1;
		rok=Number(aDatum[2]);
		if (rok<100) rok+=2000;
		datum= new Date(rok,mesic,den);
		dnes = new Date();
		if (when=='history' && dnes<=datum) return false;
		if (when=='future' && dnes>=datum) return false;
		return true;
	} else return false;
}

function checkTime(time)
{	var re=/(\d{1,2}):(\d{1,2})/; 
	return re.test(time);
}


function checkMail(email)
{	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(email);
}

function cisla(myfield, e, dec)
{
var key;
var keychar;
if (window.event)
   key = window.event.keyCode;
else if (e)
   key = e.which;
else
   return true;
keychar = String.fromCharCode(key);

if ((key==null) || (key==0) || (key==8) ||
    (key==9) || (key==13) || (key==27) )
   return true;

else if ((("0123456789"+dec).indexOf(keychar) > -1))
   return true;

else
   return false;
}

function CheckCB(frm,yn)
{	for(i=0; i<frm.length; i++)
	{	e=frm.elements[i];
		if (e.type=='checkbox') { e.checked=yn };
	}
}