// JavaScript Document

function inputMask(input, mask)
{	
	var index = 0;
	var len = input.value.length;
		
	while ((index < len) && (len != 0))
		if (mask.indexOf(input.value.charAt(index)) == -1)
		{
			if (index == len-1)
				input.value = input.value.substring(0, len-1);
			else if (index == 0)
				 	input.value = input.value.substring(1, len);
				 else input.value = input.value.substring(0, index)+input.value.substring(index+1, len);
			index = 0;
			len = input.value.length;
		}
		else index++;
}	

// clear pass

function clear_user(obj)
{
  if (obj.txtUsername.value == "UserName")
  {
    obj.txtUsername.value = ""
    return
  }
}
function clear_pass(obj)
{
  if (obj.txtPassword.value == "Password")
  {
    obj.txtPassword.value = ""
    return
  }
}
function clear_email(obj)
{
  if (obj.txtEmail.value == "Email")
  {
    obj.txtEmail.value = ""
    return
  }
}
function clear_search(obj)
{
  if (obj.txtKeyword.value == "Nhập Từ Khóa")
  {
    obj.txtKeyword.value = ""
    return
  }
}