Change onclick attribute doesnt work

Question

I have one function and when i use it one or two times it works fine, but when i use it more times does not work fine, and the change of the onclick attribute does not works more times.

<div class="box_title" onclick="MostrarMyText(1, 1)" id="menu1">QUIÉNES SOMOS</div>
<div class="box_title" onclick="MostrarMyText(2, 2)" id="menu2">QUIÉNES SOMOS</div>
<div class="box_title" onclick="MostrarMyText(3, 3)" id="menu3">QUIÉNES SOMOS</div>
<div class="box_title" onclick="MostrarMyText(4, 4)" id="menu4">QUIÉNES SOMOS</div>

function MostrarMyText(id_txt, id_esconder){
    if (TouchedByUser == 94){       
        $('#menu'+id_txt).animate({

            width : '+=5%'
        }, 500);
        $('#MyText'+id_txt).show( 2500);
        TouchedByUser = 74;
    }
    else{
        $('#menu'+id_esconder).animate({

            width : '-=5%'
        }, 500);    
        $('#menu'+id_txt).animate({

            width : '+=5%'
        }, 3000);
        $('#MyText'+id_esconder).hide(2500);
        $('#MyText'+id_txt).show(5500);
    }
    // I believe the problem is with this loop
    for (i = 1; i <= 4; i++) {
        $('#menu'+ i).unbind('onclick');
        $('#menu'+ i).attr('onclick', 'MostrarMyText('+i+', '+id_esconder+')');
    }

}

I was searching and reading documentation for a several hours (I think the problem is inside for), but i cant solve this.