var popup='';
function set_size() {
	document.getElementById('png').style.height=document.getElementById('container').offsetHeight + 'px';
	document.getElementById('png').style.width=document.getElementById('container').offsetWidth + 'px';
}

function show(i) {
	document.getElementById(i).style.display='block';
	popup=i;
}

function hide(i) {
	if(i=='')document.getElementById(popup).style.display='none';
	else document.getElementById(i).style.display='none';
}

function open_image(img, w, h)
 {
    if(img!=''){
    document.getElementById("BigImage").src="/img/"+img;
    document.getElementById("popup").style.width=w+'px';
    var tw=w/2;
    document.getElementById("popup").style.marginLeft='-'+Math.round(tw)+'px';
 	show('png');
 	show('popup');
 	set_size();
 	}
 	return false;
 }

function _close()
 {
   hide('png');
   hide('');
   return false;
 }