function clearUsername(){
		if (document.box_login.username.value =='username'){			
			document.box_login.username.value = '';
		}
	}
	function restoreUsername(){
		if (document.box_login.username.value ==''){			
			document.box_login.username.value = 'username';
		}
	}
	
	function clearPassword(){
		if (document.box_login.password.value =='password'){			
			document.box_login.password.value = '';
		}
	}
	function restorePassword(){
		if (document.box_login.password.value ==''){			
			document.box_login.password.value = 'password';
		}
	}