function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function goToNewPage() { 
	var dropdownlist = document.getElementById("dropdownlist");
	var sitesGoButton = document.getElementById("sitesGoButton");				  
	sitesGoButton.onclick = function() {
		if (dropdownlist.value != "") {
			window.open(dropdownlist.value);
			return false;
		}else {
			return false;
		}
	}
}

function goLang() {
	if (document.getElementById("menu")) {
		var menu = document.getElementById("menu");
		menu.onchange = function() {
			if (menu.value != "choose") {
				window.location = menu.value;
			}
		}
	}
}

addLoadEvent(goToNewPage);
addLoadEvent(goLang);