var browser = {
  documentHeight: function() {
	// all except Explorer
	if (self.innerHeight) 
	   return self.innerHeight;
	// Explorer 6 Strict Mode
	if (document.documentElement && document.documentElement.clientHeight) 
	   return document.documentElement.clientHeight;
	// other Explorers
	if (document.body) 
	   return document.body.clientHeight;
	// default
	return 750;
  },
  documentWidth: function() {
    // all except Explorer
    if (self.innerWidth) 
       return self.innerWidth;
    // Explorer 6 Strict Mode
    if (document.documentElement && document.documentElement.clientWidth) 
       return document.documentElement.clientWidth;
    // other Explorers
    if (document.body) 
       return document.body.clientWidth;
    // default
    return 1000;
   }
 }