$().data jQuery Demo

$(
	function(){
		
		// Get a refernce to our button.
		var jButton = $( "form :button" );
		
		// Bind the initial click count.
		jButton.data( "clickCount", 0 );
			
		// Hook up the click handler.
		jButton.click(
			function( objEvent ){
				
				// Get the current click count.
				var intCount = jButton.data( "clickCount" );
				
				// Increment the click count.
				intCount++;
				
				// Store it back in the button data.
				jButton.data( "clickCount", intCount );
				
				// Update the button display.
				jButton.val( "Click Me ( " + intCount + " )" );
				
			}
			);
		
	}
	);