[Zaja]

http://www.7dana.com/img/I_agree_demo.gif

1. open skin/customer/main/checkout.tpl and add following code after {capture name=checkout_dialog}:

<script type="text/javascript">
{literal}
//"Accept terms" form submission- By Dynamic Drive
var checkobj
function agreesubmit(el){
checkobj=el
if (document.all||document.getElementById){
for (i=0;i<checkobj.form.length;i++){
var tempobj=checkobj.form.elements[i]
if(tempobj.type.toLowerCase()=="button")
tempobj.disabled=!checkobj.checked
}}}
{/literal}
</script>

2. replace:

{$lng.txt_you_are_agree} "{$lng.lbl_terms_n_conditions}" {$lng.lbl_and} "{$lng.lbl_privacy_statement}".

with:

<input name="agreecheck" type="checkbox" onclick="agreesubmit(this)" /> {$lng.txt_you_are_agree} "{$lng.lbl_terms_n_conditions}" {$lng.lbl_and} "{$lng.lbl_privacy_statement}".
 

3. replace:

{include file="buttons/button.tpl" button_title=$lng.lbl_submit_order style="button" href=$button_href}

with:

<input type="button" value="{$lng.lbl_submit_order}" onclick="{$button_href}" style="padding: 4px; color: #BD0000; font-weight: bold;" disabled="disabled" />

Thats it! Using this hack, I have reduced the numbers of absurd questions by 30-40%.

New 4.2 and 4.3 version(11-25-2009): http://www.7dana.com/Must-Accept-terms-before-submitting-the-order/