My javascript utils

/**/ /* This function is use to check the length whether current length is overflow the designated length, on control get focus or on key up
*  ctrlId: target control
*  return: max length
*/
function  lengthCheck(ctrlId,max) ... {
        var oControl = ctrlId;
        var oX = getAbsoluteLeft(oControl);
        var oY = getAbsoluteTop(oControl);
        
        var oCounter = document.getElementById('dCounter');    
        oCounter.style.display='block';
            
        if(getBytesLength(oControl.value) > max)...{
            for(var i =1; i<oControl.value.length;i++)...{
                //alert(getBytesLength(oControl.value.substr(0,i)));
                if(getBytesLength(oControl.value.substr(0,i+1))>=max)...{
                    oControl.value = oControl.value.substr(0,i);        
                }
            }            
        }
 
        if(oCounter!=null)...{
            oCounter.innerHTML = getBytesLength(oControl.value)+"/"+max;
            oCounter.style.left = oX-20; 
            oCounter.style.top = oY-20;
        }
}

/**/ /* This function is use to check the length whether current length is overflow the designated length, on control lose focus
*  ctrlId: target control
*  return: max length
*/
function  lengthCheckOver(ctrlId,max) ... {
        var oControl = ctrlId;
        var oX = getAbsoluteLeft(oControl);
        var oY = getAbsoluteTop(oControl);
            var oCounter = document.getElementById('dCounter');    
        
        if(getBytesLength(oControl.value) > max)...{
            for(var i =1; i<oControl.value.length;i++)...{
                //alert(getBytesLength(oControl.value.substr(0,i)));
                if(getBytesLength(oControl.value.substr(0,i+1))>=max)...{
                    oControl.value = oControl.value.substr(0,i);        
                }
            }
             
        }

        if(oCounter!=null)...{
            oCounter.innerHTML = getBytesLength(oControl.value)+"/"+max;
            oCounter.style.left = oX-20;
            oCounter.style.top = oY-20;
            oCounter.style.display='none';
        }
}

/**/ /* This function is use to get bytes length from a string which either ASCII or Uncode.
*  str: appointed string
*  return: bytes length
*/
function  getBytesLength(str)
... {
    var re=/[