IE8 RC1 raise: Error: Not implemented when using setExpression in the blockUI plugin (v 2.14).
Here is the first line it crashes on: s.setExpression('height','Math.max(document.body.scrollHeight, document.body.offsetHeight) - (jQuery.boxModel? 0:'+opts.quirksmodeOffsetHack+') + "px"') To be able to use the plugin, I had to force IE7 emulation in the header: <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />