linktrimmer remove frames serendipity.js

because of ReferenceError: jQuery is not defined with
jQuery(function() {
    jQuery('input[type="url"]').change(function() {
        if (this.value != '' && ! (this.value.substr(0,7) == 'http://' || this.value.substr(0,8) == 'https://')) {
            this.value = 'http://' + this.value;
        }
    });
})

This is specific to netzgestaltung. I dont have that issue.