function switchForm(useful, idOfDiv)
{
     //changes the visibility of the form depending upon if yes or no selected.
    if(useful == 'yes')
    {
      //change visibility to none
    document.getElementById(idOfDiv).style.display = 'none';
    }
    else if (useful == 'no')
    {
      //change visibility to block, or 'visible'
        document.getElementById(idOfDiv).style.display = 'block';
    }
    
}
function hideForm(idOfDiv)
{
    //hides the form at page load if javascripot enabled and until user chooses the no option
    document.getElementById(idOfDiv).style.display = 'none';
}
 

function overImage(imgId, imageSrc)
{
    document.getElementById(imgId).src=imageSrc;
    return;
}