time = 60; //time in seconds
document.getElementById('ads_counter').innerHTML = time;
inter = setInterval("decrease();",1000);

function decrease()
	{
	time--;
	document.getElementById('ads_counter').innerHTML = time;
	if(time==0)
		{
		show_video();
		}
	}

function show_video()
	{
	clearInterval(inter);
	document.getElementById('reklama').style.display='none';
	document.getElementById('video_embed').style.display=''
	}