function openFoto(cesta,imageWidth,imageHeight,posLeft,posTop) {  // v4.01
	if(!imageWidth) imageWidth = 640;
	if(!imageHeight) imageHeight = 480;

	 srcRatio  = imageWidth/imageHeight; 
       destRatio = 800/600; 
       if ( imageHeight > 600) { 
            imageHeight= 600; 
            imageWidth= 600*srcRatio; 
       } 
       if (imageWidth > 800) { 
           imageWidth= 800; 
           imageHeight = 800/srcRatio; 
       }  

	/*if(imageWidth>800) imageWidth = 800;
	if(imageHeight>600) imageHeight = 600;*/

	imageHeight = imageHeight+40;
	imageWidth = imageWidth +20;

	// centering win if no winpos defined
	//if(!posLeft) posLeft = ( screen.width - imageWidth)/2;
	//if(!posTop) posTop = ( screen.height - winHeight)/2;;

	var newwin=window.open(cesta,"okno","width="+imageWidth+",height="+imageHeight+",scrollbars=no,left="+posLeft+",top="+posTop);
	newwin.focus();
	}
		
function openTour(cesta) {  // v4.01
	window.open(cesta,"okno","fullscreen");
	}