function changeDisplay(elem,displayMode){
document.getElementById(elem).style.display = displayMode;

}

function toggleDisplay(elem){

	if (document.getElementById(elem).style.display == 'none')
	{
		changeDisplay(elem,'block');
		return 'block';

	} else {
          changeDisplay(elem,'none');
		return 'none';
	}
}
function toggleDisplayText(divname, linkname, hidetext, showtext){

	if(toggleDisplay(divname) == 'block')
	{
		document.getElementById(linkname).textContent  = hidetext; //for firefox
		document.getElementById(linkname).innerText  = hidetext;   //for IE
	} else {
          document.getElementById(linkname).textContent  = showtext;
		document.getElementById(linkname).innerText  = showtext;
	}
}