Code gets automatically adjusted!

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I am having an issue when I put in

<input type="button" id="printButton" onclick="window.print();" value="Print these Deals" />

it comes out (after zencart automatically redoes the code) i don't want it to rearrange my code)

<input type="button" id="printButton" onclick="function onclick(event) {

    function onclick(event) {
        window.print();
    }

}" value="Print these Deals" />

after i update my products in the admin / products

If i preview it the print button works fine, it's as soon as i click update is when it automatically rearranges the code.

Please help!

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Update;
When ever I toggle between HTML source and back it adds another

    function onclick(event) {

        function onclick(event) {

            function onclick(event) {

                function onclick(event) {

                    function onclick(event) {

                        function onclick(event) {

                            function onclick(event) {

                                function onclick(event) {

                                    function onclick(event) {

why is zen cart doing this?