Oleg Front

var i = 0;
		$('td').click(function() {
		  i = i + 1;
		  console.log(i);
		  console.log($(this));

		  // if(i % 2) {
		  // 	...
		  // }else{
		  // 	....
		  // }
		});

var cachedCell = null;
		$('td').click(function() {
			var $this = $(this);
			if(cachedCell === null)
				return cachedCell = $this;
			
			var targetColor = $this.attr("bgcolor");
			var cachedColor = cachedCell.attr("bgcolor");
			$this.attr("bgcolor", cachedColor);
			cachedCell.attr("bgcolor", targetColor);
			cachedCell = null;
		});