Im wondering if its possible to call a file when the resize window match on the set variable,, do you think its possible in the codes below? it can call a php file but it will need to take a refresh just to call the another file..

PHP Code:
<!DOCTYPE html>
<
html>

<
head>
<
script type="text/javascript" src="http://code.jquery.com/jquery-1.8.3.min.js"></script>


<script>

var a = $(window).width();

if(a>=970){

    $.get("970x250.php",
    {
    //ads: "getrssfeeds",//source: 8,//site: 2584,//limit: 5,
    },

    function(data){
    $("body").append(data);
        }
    );
}    
else if(a>=320){
    $.get("970x90.php",
    {
    //ads: "getrssfeeds",//source: 8,//site: 2584,//limit: 5,
    },

    function(data){
    $("body").append(data);
        }
    );
}


</script>
</head>

<body>




</body>
</html>