ajax jquery problem


I have the following code:
    url : "pararlectura.php",
    type: "POST",
    success: function(data, textStatus, jqXHR)
		var prueba = data
        if (prueba == "YA"){
			alert ("test");

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My problem is that my alert(prueba) return YA, but alert("test") loop never executes, what is happening?
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replace : if (prueba == "YA"){
by : if ($.trim(prueba) == "YA"){
or by : if (prueba.replace(/^[^a-z]|[^a-z]$/gi,"") == "YA"){

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joyacv2Author Commented:
excellent! i will close this and open another question about something in this code! Thanks!
joyacv2Author Commented:
works perfect!
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