function show(id) {
	    obj = document.getElementsByTagName("div");
	    if (obj[id].style.display == 'none'){
	    obj[id].style.display = 'block';
	    }
	    else {
	    obj[id].style.display = 'none';
	    }
	}
	function showshow(id) {
	    obj = document.getElementsByTagName("div");
	    if (obj[id].style.display == 'none'){
	    obj[id].style.display = 'block';
	    }
	    else {
	    obj[id].style.display = 'block';
	    }
	}
	function hide(id) {
	    obj = document.getElementsByTagName("div");
	    if (obj[id].style.display == 'block'){
	    obj[id].style.display = 'none';
	    }
	    else {
	    obj[id].style.display = 'none';
	    }
	}
	function hideintro(id) {
	    obj = document.getElementsByTagName("div");
	    obj[id].style.display = 'none';
	}