var TextUtil = new Object;
  
  TextUtil.isNotMax = function(oTextArea) {
      return oTextArea.value.length != oTextArea.getAttribute("maxlength");
  };
  
  TextUtil.blockChars = function (oTextbox, oEvent, bBlockPaste) {
  
      oEvent = EventUtil.formatEvent(oEvent);
           
      var sInvalidChars = oTextbox.getAttribute("invalidchars");
      var sChar = String.fromCharCode(oEvent.charCode);
      
      var bIsValidChar = sInvalidChars.indexOf(sChar) == -1;
         
      if (bBlockPaste) {
          return bIsValidChar && !(oEvent.ctrlKey && sChar == "v");
      } else {
          return bIsValidChar || oEvent.ctrlKey;
      }
  };
  
  TextUtil.allowChars = function (oTextbox, oEvent, bBlockPaste) {
  
      oEvent = EventUtil.formatEvent(oEvent);
           
      var sValidChars = oTextbox.getAttribute("validchars");
      var sChar = String.fromCharCode(oEvent.charCode);
      
      var bIsValidChar = sValidChars.indexOf(sChar) > -1;
      
      if (bBlockPaste) {
          return bIsValidChar && !(oEvent.ctrlKey && sChar == "v");
      } else {
          return bIsValidChar || oEvent.ctrlKey;
      }
  };
  
  TextUtil.blurBlock = function(oTextbox) {
  
      //get the invalid characters
      var sInvalidChars = oTextbox.getAttribute("invalidchars");
  
      //split the invalid characters into a character array
      var arrInvalidChars = sInvalidChars.split("");
      
      //iterate through the characters
      for (var i=0; i< arrInvalidChars.length; i++){
          if (oTextbox.value.indexOf(arrInvalidChars[i]) > -1) {
              alert("Character '" + arrInvalidChars[i] + "' not allowed.");
              oTextbox.focus();
              oTextbox.select();
              return;
          }
      }    
  };
  
  TextUtil.blurAllow = function(oTextbox) {
      //get the valid characters
      var sValidChars = oTextbox.getAttribute("validchars");
      
      //split the textbox value string into a character array
      var arrTextChars = oTextbox.value.split("");
     
      //iterate through the characters
      for (var i=0; i< arrTextChars.length; i++){
          if (sValidChars.indexOf(arrTextChars[i]) == -1) {
               alert("Character '" + arrTextChars[i] + "' not allowed.");
               oTextbox.focus();
               oTextbox.select();
               return;
          }
      }
  };    
  
  TextUtil.numericScroll = function (oTextbox, oEvent) {
  
      oEvent = EventUtil.formatEvent(oEvent);
      var iValue = oTextbox.value.length == 0 ? 0 :parseInt(oTextbox.value);
      
      var iMax = oTextbox.getAttribute("max");
      var iMin = oTextbox.getAttribute("min");
  
      if (oEvent.keyCode == 38) {
          if (iMax == null || iValue < iMax) {
              oTextbox.value = (iValue + 1);
          }
      } else if (oEvent.keyCode == 40){
          if (iMin == null || iValue > iMin) {
              oTextbox.value = (iValue - 1);
          }
      }
  };
  
  TextUtil.autosuggestMatch = function (sText, arrValues) {
  
      var arrResult = new Array;
  
      if (sText != "") {
          for (var i=0; i < arrValues.length; i++) {
              if (arrValues[i].indexOf(sText) == 0) {
                  arrResult.push(arrValues[i]);
              }
          }
      }
  
     return arrResult;
  
  };
  
  TextUtil.autosuggest = function (oTextbox, arrValues, sListboxId) {
      
      var oListbox = document.getElementById(sListboxId);
      var arrMatches = TextUtil.autosuggestMatch(oTextbox.value, arrValues);
      
      ListUtil.clear(oListbox);
      
      for (var i=0; i < arrMatches.length; i++) {
          ListUtil.add(oListbox, arrMatches[i]);
      }
      
  };