function setup() {
	document.getElementById("logo").onclick = setLogo;
	setLogo()
}

function setLogo() {
	var glyphs = Array("▧", "▤", "▥", "▨", "▩");
	var glyph = glyphs[Math.floor(Math.random()*glyphs.length)];
	document.getElementById("logo").innerHTML = glyph;
}
window.onload = setup;