function teachers_guide() {
  window.open('teachers_guide.html','','scrollbars=yes,menubar=no,height=500,width=350,resizable=yes,toolbar=no,location=no,status=no');
}
function clearSmileys() {
	document.getElementById("smileys").innerHTML = "";
}
function smileyAnimation(x,y) {
	setTimeout("displaySmiley(1,"+x+","+y+")", 300);
	setTimeout("displaySmiley(2,"+x+","+y+")", 500);
	setTimeout("displaySmiley(3,"+x+","+y+")", 800);
	setTimeout("displaySmiley(4,"+x+","+y+")",1100);
}
function displaySmiley(index,x,y) {
	document.getElementById("smileys").style.zIndex = 1000;
	document.getElementById("smileys").innerHTML = 
	    document.getElementById("smileys").innerHTML +
		'<img src="http://theingots.org/Ottos_club/common/smileys/0'+
					index+'.png" '+
		' id="smiley0'+index+'" width="240" height="241"'+
		' style="position:absolute; top: '+y+'px; left: '+x+'px" />';
	document.getElementById("smiley0"+index).style.zIndex = 1000 + index;
}