Validating Checkbox arrays with javascript for a php mail script

Hello, I have been having this problem, getting my values from a checkbox to validate, the reason is because they are in arrays, and I can't seem to figure out how to validate arrays. My script for the input looks like this


<input type="checkbox" name="radiobuttons[]" value="Gestion de Procesos">

<input type="checkbox" name="radiobuttons[]" value="Gestión Documental">

of course I have 10 of these, but I can't figure out how to validate them, I tried something like this

if(!document.theform.radiobuttons[0]) && (!document.theform.radiobuttons[1]) && (!document.theform.radiobuttons[2])
{
alert "Please enter an option";
return false;
}

but it doesn't seem to work. Any suggestions on how to set this up would be greatly appreciated. Thanks!

Hi iggy1253, welcome to the forums,
Maybe this validation article will help.
http://www.devarticles.com/c/a/JavaScript/Developing-a-simple-validation-library-in-JavaScript/
http://www.devarticles.com/c/a/JavaScript/Developing-a-simple-validation-library-in-JavaScript-continued/
and if you want more try
http://www.devarticles.com/c/a/JavaScript/An-in-depth-discussion-of-JavaScript-Arrays/