error in jquery and javascript

Hi,

I want to do this, what is wrong? Is there a addClass in javascript that doesn't remove the existing class?

tbl.rows[r].cells.item(c).className = "ty";
var trd = tbl.rows[r].cells.item(c);
$("trd").addClass("vacant");      

the idea is to append a class to the existing one to finish like that

<td class "ty addClass">test</td>
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joyacv2Asked:
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Chris StanyonConnect With a Mentor Commented:
If you want to add a class in pure Javascript, rather than using jQuery's addClass() method, then something like this:

var trd = tbl.rows[r].cells.item(c);
trd.className += " vacant"; //don't forget the space!

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Chris StanyonCommented:
You're mixing javascript with jQuery so your code look a bit of a mess, but addClass() won't remove other classes. You don't need the quotes around trd. Try this:

$(trd).addClass("vacant");
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