version 1.2.6: // internal only, use hasClass("class") has: function( elem, className ) { return jQuery.inArray( className, (elem.className ||elem).toString().split(/\s+/) ) > -1; }very compatible patch: // internal only, use hasClass("class") has: function( elem, className ) { var classes= elem.className || elem; if( classes instanceof RegExp ) return !className.replace( classes, '' ); return jQuery.inArray( className,classes.toString().split(/\s+/) ) > -1; }true way ;-): // internal ...