function swap_preview (liprev) {
	setTimeout(
			function(){
				start_swap_preview(liprev);
			},300);
}
	
function start_swap_preview(liprev) {
	var templiprev = liprev.substr(0, liprev.length-1);
	
	if (templiprev=="lipreview"){	
		document.getElementById('lipreview1').style.display = 'none';
		document.getElementById('lipreview2').style.display = 'none';
		document.getElementById('lipreview3').style.display = 'none';
			
		document.getElementById(liprev).style.display = 'block';
	}
	
	if (templiprev=="liverlosung"){	
		document.getElementById('liverlosung1').style.display = 'none';
		document.getElementById('liverlosung2').style.display = 'none';
		document.getElementById('liverlosung3').style.display = 'none';
			
		document.getElementById(liprev).style.display = 'block';
	}
	
}