Splice two lists

[danmcleran at yahoo.com]

Is there a good way to splice two lists together without resorting to a
manual loop? Say I had 2 lists:

l1 = [a,b,c]
l2 = [1,2,3]

And I want a list:

[a,1,b,2,c,3] as the result.

I've been searching around but I can't seem to find a good example.

Thanks,

Dan McLeran