//preload images
function preloadImages() {
	if (document.images) {
  	cz_on = newImage("images/flag.cz.over.gif");
  	en_on = newImage("images/flag.en.over.gif");
  	de_on = newImage("images/flag.de.over.gif");
	}
}


//shows image
function showImage(sID){   	
		//shows image
		document[sID].src = 'images/flag.'+sID+'.over.gif';
	}

//hide image
function hideImage(sID){   	
		//shows image
		document[sID].src = 'images/flag.'+sID+'.gif';
}

//shows image
function customImage(sID, myFilename){   	
		//shows image
		document[sID].src = 'images/' + myFilename;
	}