function ajaxtimer(){
	//put the return of php's show_now func
	//to the javascript show_me func as a parameter
	x_show_now(show_me);
	
	//do it every 1 second
	setTimeout("ajaxtimer()", 3000);
}

function show_me(date_server) {
	document.getElementById("screen").innerHTML = date_server;
}