function showText(n) {
		
  var articles = document.getElementById('article_text').getElementsByTagName('div');
		
  for(var i=0; i<articles.length; i++) {articles[i].style.display = 'none'; }
		
  var article = document.getElementById('s'+n);

  article.style.display = 'block';
}

function loadTeacher() {
	if(location.href.search("#") != -1) {
		showText(3);
	document.location.href=document.location.href;
	}	
}

      var totop = { gogo: function(){
        $(document).ready(function() {
            
            var divId = "upup";
            var imgPath = "files/img/up.png";
            
            $("body").append("<div id='"+divId+"'></div>");
            
            var divUp = $("#"+divId);
            
            var leftPos = $("#container").offset().left;
            
            var sideOffset = Math.abs(Math.ceil(leftPos-35))+'px';
            
            divUp.css({
                'backgroundImage':'url('+imgPath+')',
                'visibility':'hidden',
                'position':'fixed',
                'cursor':'pointer',
                'height':'35px',
                'width':'35px',
                'bottom':'50px',
                'right':sideOffset
                });
            
            $(document).scroll(function(){
                
                if(divUp.offset().top>$(window).height()){
                    divUp.css({'visibility':'visible'});
                } 
                else {
                    divUp.css({'visibility':'hidden'});
                }
            })
            
            divUp.click(function() {
                
                $(document).scrollTop(0);

            })
        
        })
        }
        }
        
totop.gogo();