function otevri(F,H,W) {
  window.open(F,null,'directories=0,location=0,menubar=0,resizable=0,scrollbars=0,status=0,toolbar=0,height='+H+',width='+W+',top='+((screen.availHeight/2)-(H/2))+',left='+((screen.availWidth/2)-(W/2)));
}


function switchit(co,kde) {
	document.getElementById('mainPic').src=co;
	document.getElementById('sipka1').style.visibility='hidden';
	document.getElementById('sipka2').style.visibility='hidden';
	document.getElementById('lastArrow').style.visibility='hidden';
	document.getElementById(kde).style.visibility='visible';
}



function switchit(co,kde) {
	document.getElementById('mainPic').src=co;
	document.getElementById('sipkax').style.visibility='hidden';
	document.getElementById('sipkay').style.visibility='hidden';
	document.getElementById(kde).style.visibility='visible';
}