So, you want EventGhost to send a command to your xbox to turn it on and then turn on the reciever and switch it to the correct input? I'd program a macro in eventghost to do all 3 things.
If you actually need to navigate to the xbox page use the onclick event to call the eventghost page with your eventghost command and then use javascript to navigate the page to the xbox page. e.g.... onclick="clickbutton('index.html?HTTP.REC_PWRON_DV D');window.location.href='http://192.168.1.6/default.asp'"