gistfile1.js

$('table.board').click(function(e) {
	
	var target = e.target;
	
	if (target.nodeName == 'TD') {
	
		var params = {
			rowIndex:  target.parentNode.sectionRowIndex,
			cellIndex: target.cellIndex
		};
			
		$.getJSON(
			'http://yourdomain.com/movechecker.py',
			params,
			function(data) { //callback function
				var allowed = data.allowed || false;
				if (allowed === true) {
					target.appendChild(previouslySelectedDIVElement);
					target = null;
				}
			}
		);
			
	}
	
});