zkolya,
el.val(el.val().replace('<div class="ui-resizable-handle ui-resizable-e" style="z-index: 90; display: block;"><\/div><div class="ui-resizable-handle ui-resizable-s" style="z-index: 90; display: block;"><\/div><div class="ui-resizable-handle ui-resizable-se ui-icon ui-icon-gripsmall-diagonal-se" style="z-index: 90; display: block;"><\/div>', " "));