Back and Forward Control for an iframe using pure JavaScript/JQuery

I need to create a tightly controlled environment for opening certain pages that need back and forward navigation controls. I had poked around on here and found this question and tried to implement it, but I'm having a problem.

I have the following for the HTML and Javascript going on, assume it's already styled (reusing code from previous project), and JQuery is already listed in the <head></head> tags:

    <div id="header">
        <div id="shortcutbar">
            <a id="backBtn" onclick =="iframeBack();"></a>
            <a id="forwardBtn" onclick =="iframeForward();"></a>
    <div id="displayContainer">
        <iframe id="display" src="">

        function iframeBack() {
        function iframeForward() {

Checking the console, I get the following error: Uncaught TypeError: Cannot read property "history" of undefined and it gives both whatever line the function is called in the HTML, and the line of the function itself in the script tags.

I'm at a loss of what isn't working, as everything I've found thus far just refers to some variation of what I've already typed.

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