make the .jsee file and put it inside:

var check = document.selection.Find("[\\t\\s]*\\n[\\t\\s]*\\n",eeFindNext | eeFindAround | eeFindReplaceRegExp); while (check) {check = document.selection.Replace("[\\t\\s]*\\n[\\t\\s]*\\n","\\n",eeFindNext | eeReplaceAll | eeFindReplaceRegExp);}