i dont understand, this is where my template is located and my jscript folder is

includes/template/template_default/jscript

i placed the jscript in there, and then in the onload folder placed the file and text in the file onload=terms();

but have no idea where to add my

<div id="question" style="display:none; cursor: default">
<h1>you must be 21 years of age to enter this site. Do you agree to the terms?</h1>
<input type="button" id="yes" value="Yes" />
<input type="button" id="no" value="No" />
</div>
with the buttons, am i doing this completely wrong, as i said before im new to this php stuff and this is my first php page..