window.onload = function() {
	var titleBlock	= document.getElementById('site-title-link');
	if(window.addEventListener){
		titleBlock.addEventListener('mouseover', show, false);
		titleBlock.addEventListener('mouseout', hide, false);
	} else { // IE
		titleBlock.attachEvent('onmouseover', show);
		titleBlock.attachEvent('onmouseout', hide);
	}
}

function show() {
	var bubbleBlock	= document.getElementById('bubble');
	bubbleBlock.style.display = "block";
}

function hide() {
	var bubbleBlock	= document.getElementById('bubble');
	bubbleBlock.style.display = "none";
}