function toggle(div_id) {
	var el = document.getElementById(div_id);
	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
	else {el.style.display = 'none';}
}
function blanket_size(popUpDivVar) {
	if (typeof document.body.clientHeight != 'undefined') {
		viewportheight = document.body.clientHeight;
	} else {
		viewportheight = document.documentElement.clientHeight;
//		viewportheight = window.innerHeight;
	}
	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
		blanket_height = viewportheight;
	} else {
		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
			blanket_height = document.body.parentNode.clientHeight;
		} else {
			blanket_height = document.body.parentNode.scrollHeight;
		}
	}
	
	blanket_height = viewportheight;
	var blanket = document.getElementById('blanket');
	blanket.style.height = blanket_height + 'px';
	var popUpDiv = document.getElementById(popUpDivVar);
        popUpDiv_height=70;//posledni cislo je pulka vysky vnitrniho popup okna
//        popUpDiv_height=document.body.clientHeight/2-200;//posledni cislo je pulka vysky vnitrniho popup okna
//        document.documentElement.clientHeight
	popUpDiv.style.top = popUpDiv_height + 'px';
}
function window_pos(popUpDivVar) {
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerHeight;
	} else {
		viewportwidth = document.documentElement.clientHeight;
	}
	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
		window_width = viewportwidth;
	} else {
		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
			window_width = document.body.parentNode.clientWidth;
		} else {
			window_width = document.body.parentNode.scrollWidth;
		}
	}
	var popUpDiv = document.getElementById(popUpDivVar);
	window_width=window_width/2-350;//posledni cislo je pulka sirky vnitrniho popup okna
	popUpDiv.style.left = window_width + 'px';
}
function popup(windowname) {
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);		
}
function popupESC(e) {
        if  (e == null) { // ie             
          keycode = event.keyCode;           
        } else { // mozilla             
          keycode = e.which;           
        }           
        if(keycode == 27){ // escape, close box, esc               //what you nedd          
          popup('popUpDiv');
        }         
}