var win = null;
function NewWindow(mypage,myname,w,h,scroll){
LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
settings =
'height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',scrollbars='+scroll+',resizable'
win = window.open(mypage,myname,settings)
}

function arata(elmnt){
	document.getElementById(elmnt).style.visibility = 'visible';
	document.getElementById(elmnt).style.display = 'block';
}

function ascunde(elmnt){
	document.getElementById(elmnt).style.visibility = 'hidden';
	document.getElementById(elmnt).style.display = 'none';
}

function ascundeSTRG(){
	document.getElementsByClass('btnsterge').style.visibility='hidden';
	document.getElementsByClass('btnsterge').style.display='none';
}