[micscr]

var text = $.trim($(this).val());
var $this = $(this);
if(text.length > 2) {
    $.ajax({
        url     : "/model/tags_autocomplete.php",
        type    : "post",
        dataType: "html",
        data    : ({text : text}),
        success : function(data) {
            $this.after(data);
        }
    });
}