This is totally possible with support:
if (!$.support.leadingWhitespace) {
//IE7 and 8 stuff
}
This also detects IE 6 however, if you don't want IE 6 to run this code block, you will need another flag to exclude it
A good reason for not using browser is it is a deprecated feature, and it will likely be removed to a plugin with version 1.9.
(See the comments on the answer to How to detect IE7 with jQuery?)
"We recommend against using this property; please try to use feature detection instead (see jQuery.support). jQuery.browser may be moved to a plugin in a future release of jQuery"
http://api.jquery.com/jQuery.browser/
here is a working example: http://jsfiddle.net/AGtG8/16/
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