javascript on button click
===

I have the following JS:

    <script>
       function SetContent(link) {
                document.getElementById('lowerContent').innerHTML =
             "<iframe frameborder='0' src='" + link + "' width=100%' height='" + (screen.height - 100) + "px'";
            } 
    </script>

Which gets called like so:

    <a href="javascript:SetContent('http://urlhere);" title="URL">URL</a>

How can I make the `<a>` execute on button click? Or how to assign `"javascript:SetContent('http://urlhere);"` to `<input type=button>`

No postback is required.
The click simply resets the main div and adds an iframe with the supplied URL.
Works fine for `<a>` but not sure how to move that to a button.

onclick just causes postback and nothing else.