function showBgOverlayPic (picId, title) {

	$.getJSON("http://www.amstrom.at/plattform/modules/extgallery/public-pquery.php?photoId=" + picId,
				function(data) {
					
					document.getElementById('bgOverlay').style.display = "block";					
					document.getElementById('bgOverlay').style.height = document.body.clientHeight + "px";
										
					document.getElementById('sht_galDisplay').style.display = "block";
					
					if (isIE()) {
						document.getElementById('sht_galDisplay').style.top = (document.documentElement.scrollTop + 70) + "px"; // für IE						
					}
					else {
						document.getElementById('sht_galDisplay').style.top = (window.pageYOffset + 70) + "px";
					}										
					
					document.getElementById('sht_galImg').src = data.path;

					//wenn title == '', dann auch setzen, sonst wird titel nicht gelöscht..										
					document.getElementById('sht_title').innerHTML = title;
															
					document.getElementById('sht_Counter').innerHTML = ' ( ' + data.current + ' / ' + data.total + ' ) ';
					
					
					
					if (data.current > 1) 
						document.getElementById('sht_PrevPic').innerHTML = '<a onclick="showBgOverlayPic(' + data.prev + ', \'' + data.title_prev + '\');return false" href="#" title="Letztes Bild">&lt;&lt;</a>';
					else
						document.getElementById('sht_PrevPic').innerHTML = '';
					
					if (data.current < data.total) 
						document.getElementById('sht_NextPic').innerHTML = '<a onclick="showBgOverlayPic(' + data.next + ', \'' + data.title_next + '\');return false" href="#" title="N&auml;chstes Bild">&gt;&gt;</a>';
					else
						document.getElementById('sht_NextPic').innerHTML = '';
					
					
					//evtl noch preload für prev/next bild
					
			});
	

}

function hideBgOverlay() {
	document.getElementById('sht_galImg').src = "";	
	document.getElementById('bgOverlay').style.display = "none";
	document.getElementById('sht_galDisplay').style.display = "none";		
}

   
function isIE() {   
      return /msie/i.test(navigator.userAgent) && !/opera/i.test(navigator.userAgent);
}