Event targetting now caches event target for reposition method

PRior to this commit when using 'event' for the position target, calling the reposition
method with no event object would cause an error, since the method had no target reference
to use for positioning calculations. Previous target is now used if no event object is provided
to prevent this issue.

src/core.js

@@ -100,7 +100,7 @@ function QTip(target, options, id)
 	self.id = id;
 	self.rendered = FALSE;
 	self.elements = { target: target };
-	self.cache = { event: {}, disabled: FALSE, posClass: FALSE };
+	self.cache = { event: {}, target: NULL, disabled: FALSE, posClass: FALSE };
 	self.timers = {};
 	self.options = options;
 	self.plugins = {};
@@ -813,7 +813,7 @@ function QTip(target, options, id)
 		{
 			if(self.rendered === FALSE) { return FALSE; }
 
-			var target = options.position.target === 'event' && event ? $(event.target) : options.position.target,
+			var target = options.position.target,
 				tooltip = self.elements.tooltip,
 				posOptions = options.position,
 				my = posOptions.my, 
@@ -869,6 +869,17 @@ function QTip(target, options, id)
 				position = { top: event.pageY, left: event.pageX };
 			}
 			else {
+				// Check if event targetting is being used
+				if(target === 'event') {
+					if(event && event.target) {
+						target = self.cache.target = $(event.target)
+					}
+					else {
+						target = self.cache.target;
+					}
+				}
+
+				// Check if window or document is the target
 				if(target[0] === document || target[0] === window) {
 					targetWidth = target.width();
 					targetHeight = target.height();
@@ -877,12 +888,15 @@ function QTip(target, options, id)
 						left: target.scrollLeft()
 					};
 				}
+
+				// Use Imagemap plugin if target is an AREA element
 				else if(target.is('area') && $.fn.qtip.plugins.imagemap) {
 					position = $.fn.qtip.plugins.imagemap(target, at);
 					targetWidth = position.width;
 					targetHeight = position.height;
 					position = position.offset;
 				}
+
 				else {
 					targetWidth = target.outerWidth();
 					targetHeight = target.outerHeight();