<!-- //start hiding for older browsers
var elem, prevelem, evisibility, id, imageid, previd, the_display;
previd = "";
var plusimg = new Image();
plusimg.src = 'images/plus' + '.gif'
var minusimg = new Image ();
minusimg.src = 'images/minus' + '.gif'
function showhide(id)
    {
    
    elem = document.getElementById(id);
    evisibility = elem.style.visibility;
	the_display = elem.style.display;

        if (the_display == 'none') 
	   {
            elem.style.display = 'block';
            elem.style.visibility = 'visible';
            imageid = id + '_img';
            document.images[imageid].src = minusimg.src;
			}            
        else
         
	   {
            elem.style.display = 'none';
            elem.style.visibility = 'hidden';
            imageid = id + '_img';
            document.images[imageid].src = plusimg.src;
			}
	  }
     

-->