function check()
{
var strchoice="";
for(var i=0;i<document.news.choice.length;i )
{
if (document.news.choice[i].checked)
{
strchoice=strchoice document.news.choice[i].value ",";
}
}
if (!document.news.choice.length)
{
if (document.news.choice.checked)
{
strchoice=document.news.choice[i].value; ","
}
}
strchoice=strchoice.substring(0,strchoice.length-1);
document.news.choiceid.value=strchoice;
alert(document.news.choiceall.value);
}
</script
<html
...
<form name="news" action="test.php" method="post" onsubmit="check()"
<input type="checkbox" name="choice" value="1"
<input type="checkbox" name="choice" value="2"
<input type="checkbox" name="choice" value="3"
<input type="checkbox" name="choice" value="4"
<input type="hidden" name="choiceid" value=""
</form
...
</html