Gather html content from a remote url with JavaScript

crossdomain.js

function xdomain(par){//crossdomain function
  par.xpath=par.xpath==undefined?"*":par.xpath;
  par.type=par.type==undefined?"xml":par.type;
  var xmlhttp=new XMLHttpRequest();
  par.url = 'http://query.yahooapis.com/v1/public/yql?q='+encodeURIComponent('select * from html WHERE url="'+par.url+'" AND xpath="'+par.xpath+'"')+'&format='+par.type+'&callback=cb';
  xmlhttp.open("GET",par.url,false);
  xmlhttp.onload=function(){
    function cb(d){return d;}//callBack function for returning results from query
	par.callBack(eval(xmlhttp.responseText));
    };
  xmlhttp.send();
};
/* example usage
xdomain({
  url:"http://cropdanka.com/",// url of site
  type:"xml",//return in xml or JSON format
  xpath:"*",//filter objects
  callBack:function(data){
    console.log(data);// display object returned from request
  }
});
*/