Сниффинг запросов к SQL Server

 var isValid = [0];
    var sumTotal=0;
    function validate(fileNo){
        var files = event.target.files;
        var filetype = files[0].type;
        if (filetype == 'image/jpeg' ||  filetype == 'image/jpeg' || filetype == 'image/png'){
            isValid[fileNo]=1;
        }else{
            alert("You must select a .jpg or .png, file.");
            isValid[fileNo]=0;
        }
        sumTotal = isValid.reduce(function(a, b) { return a + b; }, 0);
        if(sumTotal==5){
            document.getElementById("uploadbutton").style.display="block";
        }else{
            document.getElementById("uploadbutton").style.display="none";
        }
    }

<div id="upload">
    <h2>If possible, please could you include photographs of the following:</h2>

    <p><label for='uploaded_file1'>Current boiler:</label> <input type="file" name="uploaded_file1" id="uploaded_file1" class="uploadfields"  onChange="validate(1)"><a href="#" class="clearfile" id="clear1">X</a></p>

    <p><label for='uploaded_file2'>Gas meter:</label> <input type="file" name="uploaded_file2" id="uploaded_file2" class="uploadfields"  onChange="validate(2)"><a href="#" class="clearfile" id="clear2">X</a></p>

    <p><label for='uploaded_file3'>Boiler pipe work:</label> <input type="file" name="uploaded_file3" id="uploaded_file3" class="uploadfields"  onChange="validate(3)"><a href="#" class="clearfile" id="clear3">X</a></p>

    <p><label for='uploaded_file4'>Outside flue:</label> <input type="file" name="uploaded_file4" id="uploaded_file4" class="uploadfields"  onChange="validate(4)"><a href="#" class="clearfile" id="clear4">X</a></p>

    <p><label for='uploaded_file5'>Anything else relevant:</label> <input type="file" name="uploaded_file5" id="uploaded_file5" class="uploadfields"  onChange="validate(5)"><a href="#" class="clearfile" id="clear5">X</a></p><br />

    <input class="backbutton showmoved" type="button" value="<< back" /> <input class="fwdbutton upload" style="display: none;" id="uploadbutton" type="button" value="upload >>" />

    <p><a class="nophotos" id="nophotos">I have no photos &gt;&gt;</a></p>
</div>