function showKortti(id)
{
	var leveys = 470;
	var korkeus = 270;
	divi = document.getElementById(id)
	
	docLeveys = document.body.offsetWidth;
	docPuolet = docLeveys / 2;
	
	divi.style.visibility = "visible";
	divi.style.position = "absolute";
	divi.style.width = leveys + "px";
	divi.style.height = korkeus + "px";
	xSijainti = docPuolet - (leveys/2);
	divi.style.left = xSijainti + "px";
	divi.style.top = 100 + "px";
	divi.style.zIndex  = 9999;
}

function hideKortti(id)
{
	divi = document.getElementById(id)
	divi.style.visibility = "hidden";
}