<script>
var radioinput = '';
function setVal(v) {
radioinput = v;
}
</script>
<input type="radio" onclick="setVal(this.value)" value="1" name="c"> 
<input type="radio" onclick="setVal(this.value)" value="2" name="c"> 
....

<input onclick="JXP(1, 'secili', 'siparis.php','list=1&amp;c='+radioinput);" value=" Gonder " type="button" name="button">