assign value from mysql to radio button inside javascript

Hi,
I am developing a quiz system.The loop in the code below prints a question,questions[0] and two options for each question,questions[1] and questions[2].questions is a 2-d javascript array.The problem is that when I select one of the 2 answer choices and post it to a php page and echo it ,the value that is echoed is questions["


Why is this happening?Thanks

<script type="text/javascript">
var j;
for(var i=1;i<=5;++i)
{
j=i-1;
document.write("<div id=\"question" + i.toString() + "\" class=\"text\">");
document.write("<script>document.write(questions[" + j.toString() + "][0]);<\/script>");
document.write("<br>");


[B]document.write('<input type="radio" name="q' + i +'"  value='questions[" + j.toString() + "][1]' >');[/B]
document.write("<script>document.write(questions[" + j.toString() + "][1]);<\/script>");

[B]document.write('<input type="radio" name="q' + i +'"  value='questions[" + j.toString() + "][2]' >');[/B]
document.write("<script>document.write(questions[" + j.toString() + "][2]);<\/script>");

document.write("<br>");


document.write("</div>");
}
</script>

Code (markup):

 

Any ideas,anyone?