var layer;

function countdown(){
	count--; 
	changelayer_content(count);
	if (count > 0){
		Id = window.setTimeout("countdown()",1000); 
	} 
	else
	{
		document.quizform.submit();
	}
}	

function changelayer_content(counter){

msgstring="Timer : "+count;

if(document.layers){
	// Browser is NS 4;
	layer = document.layers["timer"];
	layer.document.open();
	layer.document.write(msgstring);
	layer.document.close();
}
if(document.all){
	//IE Browser
	layer = document.all["timer"];
	layer.innerHTML=msgstring;
}
if(!document.all && document.getElementById){
	// Newer NS browser
	layer = document.getElementById("timer");
	layer.innerHTML = msgstring;
}
}