function login_check()
    {
     if(document.login.username.value=="")
     {
        alert("Please enter your ID");
		 return false;
      }
     else if(document.login.username.value.length<2)
     {
         alert("Invalid ID, enter again");
		 return false;
      }
     else if(document.login.password.value=="")
     {
        alert("Please enter your password");
		 return false;
      }
      else if(document.login.password.value.length<3)
      {
         alert("Invalid password, enter again");
		 return false;
      }
      else
	  {
         return true;
	  }
    }