src/jquery.iframetracker.js
function() {
			// Determine browser version (IE8-) ($.browser.msie is deprecated since jQuery 1.9)
			try {
				if ($.browser.msie === true && $.browser.version < 9) {
					this.isIE8AndOlder = true;
				}
			} catch (ex) {
				try {
					var matches = navigator.userAgent.match(/(msie) ([\w.]+)/i);
					if (matches[2] < 9) {
						this.isIE8AndOlder = true;
					}
				} catch (ex2) {}
			}

			// Listening window blur
			$(window).focus();
			$(window).blur(function(e) {
				$.iframeTracker.windowLoseFocus(e);
			});

			// Focus retriever (get the focus back to the page, on mouse move)
			$("body").append('<div style="position:fixed; top:0; left:0; overflow:hidden;"><input style="position:absolute; left:-300px;" type="text" value="" id="focus_retriever" readonly="true" /></div>');
			this.focusRetriever = $("#focus_retriever");
			this.focusRetrieved = false;

			// Special processing to make it work with my old friend IE8 (and older) ;)
			if (this.isIE8AndOlder) {
				// Blur doesn't works correctly on IE8-, so we need to trigger it manually
				this.focusRetriever.blur(function(e) {
					e.stopPropagation();
					e.preventDefault();
					$.iframeTracker.windowLoseFocus(e);
				});

				// Keep focus on window (fix bug IE8-, focusable elements)
				$("body").click(function(e) {
					$(window).focus();
				});
				$("form").click(function(e) {
					e.stopPropagation();
				});

				// Same thing for "post-DOMready" created forms (issue #6)
				try {
					$("body").on("click", "form", function(e) {
						e.stopPropagation();
					});
				} catch (ex) {
					console.log("[iframeTracker] Please update jQuery to 1.7 or newer. (exception: " + ex.message + ")");
				}
			}
		}
function() {
			// Determine browser version (IE8-) ($.browser.msie is deprecated since jQuery 1.9)
			try {
				if ($.browser.msie === true && $.browser.version < 9) {
					this.isIE8AndOlder = true;
				}
			} catch (ex) {
				try {
					var matches = navigator.userAgent.match(/(msie) ([\w.]+)/i);
					if (matches[2] < 9) {
						this.isIE8AndOlder = true;
					}
				} catch (ex2) {}
			}

			// Listening window blur
			$(window).focus();
			$(window).blur(function(e) {
				$.iframeTracker.windowLoseFocus(e);
			});

			// Focus retriever (get the focus back to the page, on mouse move)
			$("body").append('<div style="position:fixed; top:0; left:0; overflow:hidden;"><input style="position:absolute; left:-300px;" type="text" value="" id="focus_retriever" readonly="true" /></div>');
			this.focusRetriever = $("#focus_retriever");
			this.focusRetrieved = false;

			// Special processing to make it work with my old friend IE8 (and older) ;)
			if (this.isIE8AndOlder) {
				// Blur doesn't works correctly on IE8-, so we need to trigger it manually
				this.focusRetriever.blur(function(e) {
					e.stopPropagation();
					e.preventDefault();
					$.iframeTracker.windowLoseFocus(e);
				});

				// Keep focus on window (fix bug IE8-, focusable elements)
				$("body").click(function(e) {
					$(window).focus();
				});
				$("form").click(function(e) {
					e.stopPropagation();
				});

				// Same thing for "post-DOMready" created forms (issue #6)
				try {
					$("body").on("click", "form", function(e) {
						e.stopPropagation();
					});
				} catch (ex) {
					console.log("[iframeTracker] Please update jQuery to 1.7 or newer. (exception: " + ex.message + ")");
				}
			}
		}
true for Internet Explorer 8 and older Init (called once on document ready)