Example code for an ajax file upload with jQuery and HTML5.

Html5Upload.js

if(window.FormData){
    var formData = new FormData($('form#uppic', $('div#upload'))[0]);
    $.ajax({
        url:'/upload/'+gUUID,
        type:'POST',
        xhr:function(){
            var myXhr = $.ajaxSettings.xhr();
            if(myXhr.upload){//check if upload property exists
                myXhr.upload.addEventListener('progress', sendpic.progressHandle);
            }
            return myXhr;
        },
        success:sendpic.sendsuccess, //function that will receive unparsed string
        error:sendpic.senderror, //function that will receive an error object
        data:formData,
        cache:false, //important
        contentType:false, //important
        processData:false //important
    });
}