how to call Jquery function inside the JS function

Hi ,

	// Avoiding duplicate Head value 

	jQuery(function($) {
	alert("1234");
    var backups = {};
    $("select[id^=headNo]").change(function() {
        var v = $(this).val();
        alert(v);
        var f = false;
        $("select[id^=headNo]").not(this).each(function() {
        alert("456");
        alert($(this).val());
            if($(this).val() == v) {
                f = true;
                return;                
            }
        });
        if(f) {
            $(this).val(backups[$(this).attr("id")]);
            alert("Duplicated Head Value!");
        }
        else {
            backups[$(this).attr("id")] = v;
        }
    }).val(null);
});

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I have code like this in JS file . I Want to call this code from JS function how to call ?