how to determine if $(this) is for list_a or list_b?

how to determine if $(this) variable is for list_a or list_b from the following example code? If the $(this) is for list_b, how do I set for list_a at that point in the code?

$('#list_a li') .gt(' + counter +').each(function()
{
    if(textWidth < totalWidth)
    {
           $('#list_b li').append('<li>' +  textValue +   '</li>')          
           alert($this).index());
    {
});
areyouready344Asked:
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leakim971PluritechnicianCommented:
alert($this).attr("id")); // should alert  list_a or list_b
areyouready344Author Commented:
thanks leakim
areyouready344Author Commented:
leakim, it says  undefined.. but $(this).index() works
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leakim971PluritechnicianCommented:
try this one :

alert( $this).closest("ul").attr("id") ); // should alert  list_a or list_b
areyouready344Author Commented:
Okay I'll give it a try, alert($(this).closest.("ul").attr("id"));  
areyouready344Author Commented:
not working, the alert is not being fired off. alert($(this).closest.("ul").attr("id"));  
leakim971PluritechnicianCommented:
check for a typo error
areyouready344Author Commented:
the code works at the first index and then stop without generating the alert,

does this code look correct, alert($(this).closest.("ul").attr("id"));      
leakim971PluritechnicianCommented:
oops... better : alert($(this).closest("ul").attr("id"));

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areyouready344Author Commented:
wow, my eyes are bad...don't have my glasses on... thanks leakim..
areyouready344Author Commented:
it only says, ul_a but how do I get it to say ul_b?
areyouready344Author Commented:
oops, i mean the alert only says #list_a, how do i get it to say #list_b
leakim971PluritechnicianCommented:
not sure...

$('#list_a li,#list_b li').gt(' + counter +').each(function()

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