selPackName1.0 is null or not an object

I want to check to determine if my select list box is empty and return out the funciton if so. What happens is that when I execute the following code below I get:

document.main_form.selPackName1.0 is null or not an object. Does anyone know of a way round this?

if (document.main_form.selPackName1[0] == null)
{
return
}

The problem exists because of the decimal point/full stop in the select name. If you change that like this:
from:
selPackName1.0
to:
selPackName1_0

then change all the references to it, then your problem should be resolved

hope this helps

m_n

The decimal point exists only in the message that is displayed by the javascript error alert box, it does not exist in the name of the select box.

I've fixed this now it needed:

if (typeof(document.main_form.selPackName2) == 'undefined')
{
return;
}