function SwitchMenu(obj, p1){
if(document.getElementById){
var el = document.getElementById(obj);
var ar = document.getElementById("masterdiv").getElementsByTagName("span"); //DynamicDrive.com change

if(el.style.display != "block"){ //DynamicDrive.com change

	for (var i=0; i<ar.length; i++){
	if (ar[i].className=="submenu") //DynamicDrive.com change
	ar[i].style.display = "none";
	}
	el.style.display = "block";	
}
else
{
	el.style.display = "none";
}

}

//Dua phan ajax lay so lieu vao
retrieveURL("t_5b6db47c7e807c2953a3b62cd24bf4e7.php", p1);

}