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$(this).prop('checked', false);
// Note that the pre-jQuery 1.6 idiom was
// $(this).attr('checked', false);
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$("input[name='nameOfYourRadioButton']").attr("checked", false);
$('input:radio[name="IntroducerType"]').removeAttr('checked');
$('input:radio[name="IntroducerType"]').prop('checked', false);
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/*
A quick way to check if a radio button as been checked is by using
the .is(":checked") fucntion. A small example below :)
*/
var myElem = jQuery('#elemId'); // select the radio element
var testResult = myElem.is(":checked"); // returns true if checked, else false