function ForceWindow ()
{
  this.r = document.documentElement;
  this.f = document.createElement("FORM");
  this.f.target = "_blank";
  this.f.method = "post";
  this.r.insertBefore(this.f, this.r.childNodes[0]);
}
ForceWindow.prototype.open = function (sUrl)
{
  this.f.action = sUrl;
  this.f.submit();
}

var myWindow = new ForceWindow(); 
myWindow.open("http://www.ddway.com");