list of content, references

[M. Helena Schlueter]

Hi
I clicked on add table of content, so lyx inserted me the table of 
content. There is though a problem I cannot figure out how to solve it. 
There should be double space between the chapter header and the section 
header, but it is single space. single space between the section headers 
is fine. Also the size of the letters should be larger.
for the references; i included the references though it is all double 
space, but it should be single space and the letters again larger.
Does anyone know what to change and how? i guess it must be set in the 
preamble.
thanks so much
helena