This is probably the right way to do it for ie7/8

wchen-r7 · wchen-r7 · commit fc1432fe53a2 · 2014-03-27T13:53:24.000-05:00
diff --git a/data/js/detect/os.js b/data/js/detect/os.js
@@ -965,9 +965,9 @@ window.os_detect.getVersion = function(){
 				// IE8 detection straight from IEBlog.  Thank you Microsoft.
 				if (!ua_version) {
 					if (css_is_valid('display', 'display', 'table-cell')) {
-						ua_version = '8.0';
-					} else {
 						ua_version = '7.0';
+					} else {
+						ua_version = '8.0';
 					}
 				}
 			} else if (document.compatMode) {

Original file line number	Diff line number	Diff line change
`@@ -965,9 +965,9 @@ window.os_detect.getVersion = function(){`
`965`	`965`	`// IE8 detection straight from IEBlog. Thank you Microsoft.`
`966`	`966`	`if (!ua_version) {`
`967`	`967`	`if (css_is_valid('display', 'display', 'table-cell')) {`
`968`		`- ua_version = '8.0';`
`969`		`- } else {`
`970`	`968`	`ua_version = '7.0';`
	`969`	`+ } else {`
	`970`	`+ ua_version = '8.0';`
`971`	`971`	`}`
`972`	`972`	`}`
`973`	`973`	`} else if (document.compatMode) {`