document.onmouseup = showBlock;

var oldel = null;

function showBlock(curel, hel)
{
	var element = document.getElementById(hel);

	oldel = element;

	element.style.top = (curel) + 'px';
	element.style.left = (curel) + 'px';
	element.style.visibility = 'visible';
	element.style.display = 'none';
}