JS: Modernizr Box Sizing For IE7

scripts.js

    //MODERNIZR BOX SIZING FIX FOR IE7
    Modernizr.addTest("boxsizing", function() {
        return Modernizr.testAllProps("boxSizing") && (document.documentMode === undefined || document.documentMode > 7);
    });
    $(function(){
        if(!Modernizr.boxsizing){
            $('.col1, .col2').each(function(){
                var fullW = $(this).outerWidth(),
                    actualW = $(this).width(),
                    wDiff = fullW - actualW,
                    newW = actualW - wDiff;
                $(this).css('width',newW);
            });
        }
    });