<script type="text/javascript">
<!--

/*
 * jQuery Style
 * OnDomReady I´m rewrited this code!
 */

$(function(){

    //This is a CHAINNING pattern to jQuery
    $("#img_1")
    .mouseover(function(){
        $("#txt_box_id").show(300);
    });
    .mouseout(function(){
        $("#txt_box_id").hide(100);
    });
});

//-->
</script>