integrate aspx page into html/php page with frames

Hello.
I have a simple aspx page that contains a dropdownlist, a textbox, and a button.
I need the code behind to call a dll function on my server. The existing html page with frames, where i hope to use a frame for my aspx page, has several other pages. Two of these pages have javascript functions, one returns a textarea text, and the other sets a textarea text.
in javascript, to call these functions from a different page, i use:
var t1=window.parent.text1.getText(); and
window.parent.text2.setText("text");
i need to be able to use these 2 functions in my aspx page Button_Click event
Thanks for any help...