Search Depending On What User Selects

what i want to do is create several radio buttons and a textbox for
searching purposes. the search will perform a search depending on
which button the user selects.

here is what i have now:

- for each radio button, i use the onClick event handler, which calls
a function called showMe()

- showMe() {
if (button 1 was selected)
document.write('form which will search down path A');
else if (button 2 was selected)
document.write('form which will search down path B');
else if (button 3 was selected)...
}

this works, but once the user makes their selection, the search form
will pop up on another page. how do i fix it so that the search form
will display on the same page as the radio buttons? Is there any
other way to accomplish this?