String.prototype.len=function(){  
return this.replace(/[^\x00-\xff]/g,"**").length;  
}  
 
//Set maxlength for multiline TextBox  
function setMaxLength(object,length)  
{ 
     
    var result = true;  
    var controlid = document.selection.createRange().parentElement().id;  
    var controlValue = document.selection.createRange().text;  
    var tempString=object.value; 
     
    var tt="";  
    for(var i=0;i<length;i++)  
        {  
            if(tt.len()<length)  
                tt=tempString.substr(0,i+1);  
            else  
                break;  
        }  
    if(tt.len()>length) 
        tt=tt.substr(0,tt.length-1); 
    object.value=tt; 
     
     
}  
 
//Check maxlength for multiline TextBox when paste  
function limitPaste(object,length)  
{  
        var tempLength = 0;  
        if(document.selection)  
        {  
            if(document.selection.createRange().parentElement().id == object.id)  
            {  
                tempLength = document.selection.createRange().text.len();  
            }  
        }  
        var tempValue = window.clipboardData.getData("Text");  
        tempLength = object.value.len() + tempValue.len() - tempLength;  
 
        if (tempLength > length)  
        {  
            tempLength -= length;  
            var tt="";  
            for(var i=0;i<tempValue.len()-tempLength;i++)  
                {  
                    if(tt.len()<(tempValue.len()-tempLength))  
                        tt=tempValue.substr(0,i+1);  
                    else  
                        break;  
                }  
            if(tt.len()<=0) 
            {     
                window.event.returnValue=false; 
                 
            } 
            else 
            { 
                tempValue=tt;  
                window.clipboardData.setData("Text", tempValue);  
                window.event.returnValue = true;  
            } 
        }  
     
 
}  
 
function PressLength() 
{ 
     
    if(event.srcElement.type=="text" || event.srcElement.type=="textarea" ) 
    { 
        if(event.srcElement.length!=null) 
            setMaxLength(event.srcElement,event.srcElement.length); 
         
    } 
} 
 
function LimitLength() 
{ 
 
    if(event.srcElement.type=="text" || event.srcElement.type=="textarea" ) 
    { 
        if(event.srcElement.length!=null) 
            limitPaste(event.srcElement,event.srcElement.length); 
    } 
} 
document.documentElement.attachEvent('onkeyup', PressLength);  
document.documentElement.attachEvent('onpaste', LimitLength);