are there any options in jeditble, so when i double click on the text and a text box appears that selects all the text
Use the select parameter. True means select (select all). False is the opposite.
$(".editable").editable("http://www.example.com/save.php", { type : "textarea", select : true });
for doubleclick:
$(".editable").editable("http://www.example.com/save.php", { type : "textarea", event : "dblclick", select : true });