javascript - Enabling PayPal buttons with a checkbox -

im kinda of nooobie when comes coding, here goes, hope can help. asked set payment page using 2 paypal buttons. when first arrive @ page buttons need disabled, until check checkbox, means have accepted tos, , there can continue on make payment. have tried find online nothing seems work me.

this html code...

    <!--checkbox validation-->      <input id="one" type="checkbox" /> have read , agree terms &amp; conditions       <!--paypal button-->      <center>     <table> <tr>     <td>     <form action="https://www.paypal.com/cgi-bin/webscr" onsubmit="return confsubmit();"              method="post" target="_top">     <input type="hidden" name="cmd" value="_s-xclick">     <input type="hidden" name="hosted_button_id" value="2ru2nd26n2564">     <input type="image" src="http://graphicasylum.com/images/boton_100_chico.png" border="0" name="submit" alt="paypal, la forma más segura y rápida de pagar en línea.">     <img alt="" border="0" src="https://www.paypalobjects.com/es_xc/i/scr/pixel.gif" width="1" height="1">     </form>     </td>      <td> <a class="submit disabled"     <form action="https://www.paypal.com/cgi-bin/webscr" onsubmit="return confsubmit();" method="post" target="_top">     <input type="hidden" name="cmd" value="_s-xclick">     <input type="hidden" name="hosted_button_id" value="sak96y5cbtful">     <input type="image" src="http://graphicasylum.com/images/boton_50_chico.png" border="0" name="submit" alt="paypal, la forma más segura y rápida de pagar en línea.">     <img alt="" border="0" src="https://www.paypalobjects.com/es_xc/i/scr/pixel.gif" width="1" height="1"></a>     </form>     </td> </tr>     </table>     </center> 

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and js code.

    <script type="text/javascript">// <![cdata[     function confsubmit() {     if(!document.getelementbyid("accept").checked) {     alert("please read , accept terms , conditions in order continue.");     return false;     }     } // ]]></script> 

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if i'm lost (witch i'm pretty sure am) i'm willing go direction make work! in advance help. :) had put 2 paypal buttons in tables because way knew how set them side side , centered on webpage.

at glance...

if(!document.getelementbyid("one").checked) {