eval problem

Sample 1: when i call a1 its ok but when i call a2 its throw error.
if i use sample 2 its ok but i need to like sample 1
how can i call s1 from a2?
——————Sample 1——————————–

function a1()
{
var deg1 = “var d=’variables’;”+
“function s1()”+
“{“+
” var deg2=’deg2′; “+
” alert(deg2);”+
“}”;
eval(deg1);
s1();
}

function a2()
{
s1();
}

————-and sample 1——————————–

————-Sample 2————————————
var deg1 = “function s1()”+
“{“+
” var deg2=’deg2′; “+
” alert(deg2);”+
” “+
“}”;

eval(deg1);

function a1()
{
s1();
}

function a2()
{
s1();
}

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