Extension testing...

gistfile1.html

<script type="text/javascript">
	safari.application.addEventListener("command", tableGrab, false);

	function tableGrab() {
		var iDiv = document.getElementById("reservations");
		var iTable = iDiv.getElementsByTagName("table");
		var iRows = iDiv.getElementsByTagName("tr");
		var iCells = iDiv.getElementsByTagName("td");
		var ary = [];
		var ary2d = [];

		var y = irows.length;
		var z = icells.length;
		var x = Math.round( z/y );  

		ary = Array.prototype.slice.call(icells);

		for (var i = 0; i < x; i++) {
			if (ary2d[i] == null) {
				ary2d[i] = [];
			}
			for (var j = 0; j < y; j++){
				ary2d[i][j] = ary[j];
			}
		}	
	}
</script>

Here here! Wish I knew jQuery