#!/bin/bash

oldmd5="$(curl "$1" 2>/dev/null | md5sum)"

while :;
	do
	sleep 60
	md5="$(curl "$1" 2>/dev/null | md5sum)"
	if [[ $md5 != $oldmd5 ]] ; then
			echo "webpage changed"
			mail blah@blah.com
	fi
done