jQuery set radio button

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Your selector looks for the descendant of a input:radio[name=cols] element that has the id of newcol (well the value of that variable).

Try this instead (since you’re selecting by ID anyway):

$('#' + newcol).prop('checked',true);

Here is a demo: http://jsfiddle.net/jasper/n8CdM/1/

Also, as of jQuery 1.6 the perferred method of altering a property is .prop(): http://api.jquery.com/prop

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