function checkform() {
          for (i=0;i<fieldstocheck.length;i++) {
            if (eval("document.subscribeform.elements['"+fieldstocheck[i]+"'].value") == "") {
              alert("Check "+fieldnames[i]);
              eval("document.subscribeform.elements['"+fieldstocheck[i]+"'].focus()");
              return false;
            }
          }
          return true;
        }

        var fieldstocheck = new Array();
        var fieldnames = new Array();
        function addFieldToCheck(value,name) {
          fieldstocheck[fieldstocheck.length] = value;
          fieldnames[fieldnames.length] = name;
        }

        addFieldToCheck("FormValue_CustomField6","First Name");
        addFieldToCheck("FormValue_CustomField7","Last Name");
        addFieldToCheck("FormValue_CustomField8","City");
        addFieldToCheck("FormValue_Email","E-mail address");


        function imposeMaxLength(Object, MaxLen)
        {
          return (Object.value.length <= MaxLen);
        }