// MAIN BUTTON HYPERLINK FUNCTION
function MainButtonClick()
{
    //change document.location value to your http or https location.
    document.location = "http://www.heroeshappenhere.com";
}

// HEADER BUTTON HYPERLINK FUNCTION
function HeaderButtonClick()
{
    // Change document.location value to your http or https location.
    document.location = "http://www.microsoft.com/heroeshappenhere/events/default.mspx";
}