// TOOLTIP.JS
// show and hide a small tooltip next to the current element
// precond: have a div named toolTip in the document

	var timerid;
	function showTooltip(message, objEvent)
	{
		var offset = 12;
		hideTooltip();
		with (xGet("toolTip"))
		{
			if (is.ie)
			{
				style.top = event.y + offset;
				style.left = event.x + offset;
			}
			else
			{
				style.top = objEvent.layerY + offset;
				style.left = objEvent.layerX + offset;
			}
			innerHTML = message;
			style.visibility = "visible";
		}
		timerid = window.setTimeout("hideTooltip()", 3000);
	}
	
	function hideTooltip()
	{
		// first time, there is no timer
		if (timerid)  // test for undefined or null
			window.clearTimeout(timerid);
		xGet("toolTip").style.visibility = "hidden";
	}