$(document).ready(function(){

var SearchWatermark = 'nome del comune...';
$(".comuni-searchbox-c input[type=text]")
 .attr("value", "")
 .bind("focus",function(e){if (this.value==SearchWatermark){$(this).attr("value","").removeClass("i-italic");}})
 .bind("blur",function(e){if (this.value==''){$(this).attr("value",SearchWatermark).addClass("i-italic");}})
 .triggerHandler("blur");

});