// JavaScript Document

function chgImg(){
	var n = Math.floor(Math.random()*6) + 1;
	document.getElementById("mainImg").innerHTML = '<a href="http://www.getitnyc.com/english-course.htm"><img src="http://www.getitnyc.com/images/toppage/main' + n +'.jpg" alt="english school" width="307" height="220" border="0" /></a>';
}