<script type="text/javascript" src="/myfolder/webresource.axd?d=pfnsem3_something"></script>

// get all scripts
    var s = document.getElementsByTagName('script');

    // loop threw all scripts
    for(var i=0; i<s.length; i++) {
        // get source
        var src = s[i].src;
        // see if it contains query
        var result = src.search(/webresource.axd/);

        // if the result is not false
        if(result != -1) {
            // remove the script
            document.removeChild(s[i]);
        }
    }