define( function() { // A method for quickly swapping in/out CSS properties to get correct calculations. return function( elem, options, callback, args ) { var ret, name, old = {}; // Remember the old values, and insert the new ones for ( name in options ) { old[ name ] = elem.style[ name ]; elem.style[ name ] = options[ name ]; } ret = callback.apply( elem, args || [] ); // Revert the old values for ( name in options ) { elem.style[ name ] = old[ name ]; } return ret; }; } );