function showhide1(para){
            //display the section if hidden, or hide it if displayed
            if (para.style.display=="none"){para.style.display=""}
            else{para.style.display="none"}
}

function showhide2(para,pic){
            //display the section and its associated graphic, or hide the section and display a different graphic
            if (para.style.display=="none"){para.style.display="";pic.src="arrwdown.gif"}
            else {para.style.display="none";pic.src="do-it.gif"}
}