How to insert Option values through tidy,

Hi

I need to add values to Combo Boxes through html tidy,
How can i do this ?

ie  more clearly

my html is like this , and now i have to add more countries in to it

<select name="Country"  width="30">
        <option selected value="USA" name="Country">
            USA
         </option>
</select>

when i add the list would be

<select name="Country"  width="30">
        <option selected value="USA" name="Country">
            USA
         </option>
        <option selected value="India" name="Country">
            India
         </option>
</select>

How can i do this ?
can i use void InsertNodeAtStart(Node *element, Node *node) of parser.c for 
this purpose ?

please help me

Renjith.