window.onload = prepareDfn;

function prepareDfn() {
	dfn = document.getElementsByTagName("dfn");
	for(var i = 0; i < dfn.length; i++) {
		dfn[i].onmousemove = function (e) {
			x = document.all?event.clientX+document.body.scrollLeft:e.pageX;
			y = document.all?event.clientY+document.body.scrollTop:e.pageY;
			document.getElementById(this.id + "_tt").style.display = "block";
			document.getElementById(this.id + "_tt").style.left = (x+15) + "px";
			document.getElementById(this.id + "_tt").style.top = (y+15) + "px";
		}
		dfn[i].onmouseout = function() {
			document.getElementById(this.id + "_tt").style.display = "none";
		}
	}
}