Clearing ASP.NET Label control using Jquery

I have a asp.net label control . The label is inside the control
Panel
and the page also has a master page. The label ID is lbErrorList.
The label gets rendered as
"ctl00_ctl00_SubApp1_SubContent_lbErrorList"
The page also contains many textbox which needs to be populated by
user. I am trying to check if the user has filled all the textbox.
If the user does not fill the text box , the user needs to be
notified
by adding corresponding error to the lbErrorList.
I am trying to append the error messages to label as
$("#ctl00_ctl00_SubApp1_SubContent_lbErrorList").a ppend(errorList);
// errorList is a temporary variable which has the error information.
problem is the label gets appended with error list content every time
I try to submit the form and if the validation goes wrong.
I would like to clear the label whenever the submit button is
clicked,
so that if error happens then only needed error messages is
displayed.
How can I archive this...??
In brief my question is how can I clear the lbErrorList using
jquery...???
Thanks in advance...