function hdrDetails(i, elm, cl) {
        cl = cl/1024;
    var sz = cl>1024?"MB":"KB";
        cl = cl>1024?cl/1024:cl;
    var len = $(elm).eq(i).text().length;
    if(len > 0) {
        $(elm).eq(i).append(" ("+cl.toFixed(0)+" "+sz+")");
    }
}

$(function() {
    var elm="a[href$='.pdf'],";
            "a[href$='.doc'],"+
            "a[href$='.ppt'],"+
            "a[href$='.xls'],"+
            "a[href$='.docx'],"+
            "a[href$='.pptx'],"+
            "a[href$='.xlsx']";
			
    $(elm).each(function(i, e) {
        if (e.hostname && e.hostname == location.hostname) {
            $.ajax({
                type: "HEAD",
                url: $(this).attr("href"),
                complete: function(xhr, textStatus) {
                    var cl=xhr.getResponseHeader("content-length");
                    if(textStatus=="success") {
                        var cl=xhr.getResponseHeader("content-length");
                        hdrDetails(i, elm, cl);
						
                    }else{
                        $(elm).eq(i).append("<span> (file not found)</span>");
                    }
                }
            });
        }
        if (e.hostname && e.hostname !== location.hostname) { //external link
            //add the icon
           // $(this).after();
            //call json-head
            var url= "http://json-head.appspot.com/?url="+encodeURI($(this).attr('href'))+"&callback=?";
            $.getJSON(url, function(json){
                if(json.ok && json.headers["Content-Length"] && json.status_code == 200) {
					var cl = json.headers["Content-Length"];
                    hdrDetails(i, elm, cl); //run the calculations and insert a file size
					
                }
                if(json.ok && json.status_code == 404) { //file not found error
                    $(elm).eq(i).append("<span> (file not found)</span>");
                }
            });
        }
    });
});