Sort a concatenated string in sql server 2005

Hi,

 i have a string like 'd','a',c' from a query resultset.
Now, i need to sort this string and again get a concatenated output like 'a','c','d'  . How do i do it ?

i thought of passing the original value to a stored procedure or a function.. the stored proc/func will split & store the value in a temp table such that each value is a new row..

TmpSort
--------------
d
a
c

I will then query this temp table and get the sorted values..

The problem i am facing is that if i use a function, i cannot do any t-sql statements within a function and if i use a stored procedure, i cannot call it inline..
Then i thought, i will create both.. the stored procedure will do the sorting and storing the sorted value in the temp table and i will call the stored procedure within the function and make it inline.. (ofcourse there will be 2 parameters... (i) the string and (ii) the delimiter)..
but alas, this too does not work.. i cannot call a stored procedure from within a function..:-(

Could anyone suggest a workaround to achieve this ???

Thanks..