function element_on(id){
    el=document.getElementById(id).style;
    el.display="block";
}
function element_off(id){
    el=document.getElementById(id).style;
    el.display="none";
}
function nastavon(id) {
	el=document.getElementById(id).style;
	el.display='block';
}
function nastavoff(id) {
	el=document.getElementById(id).style;
	el.display='none';
}
function sleep(ms){
		var dt = new Date();
		dt.setTime(dt.getTime() + ms);
		while (new Date().getTime() < dt.getTime());
}

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)
if(win.window.focus){win.window.focus();}
}