fix #751 pixel-percentage conversions broken
fix #751 pixel-percentage conversions broken

Conversions between pixels and percents were working only in IE8-
due to a mistake in 107507a30d0407e46bcbf6dea3cf31ee28c43928.

fcapa/aria,simonarbuckle/ariatemplates,fcapa/aria,mlaval/ariatemplates,fcapa/aria,simonarbuckle/ariatemplates,ariatemplates/ariatemplates,divdavem/ariatemplates,ymeine/ariatemplates,mlaval/ariatemplates,lsimone/ariatemplates,benouat/ariatemplates,simonarbuckle/ariatemplates,vcarle/ariatemplates,benouat/ariatemplates,fbasso/ariatemplates,divdavem/ariatemplates,benouat/ariatemplates,vcarle/ariatemplates,divdavem/ariatemplates,lsimone/ariatemplates,ymeine/ariatemplates,ariatemplates/ariatemplates,ymeine/ariatemplates,fbasso/ariatemplates,ariatemplates/ariatemplates,vcarle/ariatemplates,mlaval/ariatemplates,fbasso/ariatemplates