// Function that shows a tooltip
function showTooltip(elementId, toolTipId, xOffset, yOffset){
	var myDiv = document.getElementById(toolTipId);
	var coords = getElementPosition(elementId);
	var xPos = coords.x - xOffset;
	var yPos = coords.y - yOffset;
	myDiv.style.top = yPos + "px";
	myDiv.style.left = xPos + "px";
	myDiv.style.display = 'block';
}
// Function that hides a tooltip
function hideTooltip(toolTipId){
	if(!document.getElementById) return;
	var myDiv = document.getElementById(toolTipId);
	myDiv.style.display = "none";
}