function piilota_pintanosto()
{	
	document.getElementById('overlay').style.display='none';
	document.getElementById('pintanosto').style.display='none';
}

function nayta_pintanosto()
{	
	var overlay_korkeus = document.getElementById('body').scrollHeight;
	//var overlay_leveys = document.getElementById('body').scrollWidth;
	var all_bodys = document.getElementsByTagName('body');
	var overlay_korkeus = all_bodys[0].scrollHeight;
	//var overlay_leveys = all_bodys[0].scrollWidth;
	
	// alert(overlay_leveys + ' x ' + overlay_korkeus);
	
	//document.getElementById('overlay').style.width = overlay_leveys + 'px';
	document.getElementById('overlay').style.height = overlay_korkeus + 'px';
	
	
	var pos_left = (document.body.offsetWidth/2)-350;
	//var pos_top = (document.body.offsetHeight/2)-400;	
	var pos_top = 80;	
	document.getElementById('pintanosto').style.left = pos_left +'px';
	document.getElementById('pintanosto').style.top = pos_top +'px';
	
	document.getElementById('overlay').style.display='block';
	document.getElementById('pintanosto').style.display='block';
}