[HTML] pobierz, plaintext 
Data:<br />  
<input type="text" size="14" id="data" value="np. 24/03/2012" onClick="data();">
[HTML] pobierz, plaintext 

[XML] pobierz, plaintext 
function data(){
	var to = document.getElementById('data');
	if(to.value == 'np. 24/03/2012'){
		to.value = 'zmiana1';
	}
	else{
		to.value = 'zmiana2';
	}
}
[XML] pobierz, plaintext