Hello Simon,
Yes, your onResize function can change the values of maxWidth. Here is an example: $('#resizeMe').Resizable( { minWidth: 50, minHeight: 50, maxWidth: 400, maxHeight: 400, // etc. etc. onResize : function(size, position) { this.maxWidth = size; } } ) Please note that "this" needs to be pre-pended before the variable in order to access it. ~Sean