[jQuery] Plugin function does not exist.

[jQuery] Plugin function does not exist.


    $.fn.selectMatch = function(x) {
        for (i=0; i<this[0].options.length; i++) {
            if (this[0].options[i].innerHTML == x) alert('found it');
        }
        return this;
    };
in my script im calling
$('#optionselect').selectMatch('test');
firebug blows up and tells me that selectMatch does not exist.
I have other function in this plugin that work, but they extend only
jQuery itself ( $.funcname ) not $.fn.name
Any ideas?
Thanks