Wow this new board is pretty cool - lots o' features
anyway Ben, you can't grab a radio value from an array in that manner, you need to loop through the array and find out which one is checked. Try replacing your function with the below:
function insertdata(){
var symbol = document.table.symbol;
for(i=0;1<symbol.length;i++){
if (symbol[i].checked) {
symbol = symbol[i].value;
break;
}
}
alert(symbol);
document.write(symbol);
window.close();
}
Hope that helps

<-- One click smilies I dig it