function gup(name) {
	name=name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	var regexS="[\\?&]"+name+"=([^&#]*)";
	var regex=new RegExp(regexS);
	var results=regex.exec(window.location.href);
	if(results == null){
		return "";
	}else{
		return results[1];
	}
}

var ua = new String(navigator.userAgent.toLowerCase());
var idBrowser = ua.search(/mozilla/);

function closeOrBack() {
  if ((history.length > 0 && idBrowser==-1) || (history.length > 1 && idBrowser!=-1)) { 
    window.history.back(); 
  } 
  else {
    window.close();
  }
}