selection and button

I have selection like
<select>
    <option value="" selected='nil'></option>
    <option id="conv" >シフト表CSV出力l</option>
    <option value="template_of_roster1.xml"
id="tmp1">template_of_roster1.xml</option>
    <option value="template_of_roster2.xml"
id="tmp2">template_of_roster2.xml</option>
    <option value="template_of_roster3.xml"
id="tmp3">template_of_roster3.xml</option>
<input type="button" value="Converter"/>
and also one button.

I want to write a condition like
if I choose option id==tmp1
when I click the button,want to run converter
if I choose option id ==conv
when I click the button,want to run demand_csv

I have one question more about button, is it possible to run two method
in onclick event?
like when I click button can I run converter also saving.?

thanks for any help