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HTML code:

<script language="javascript" runat="server" >
function textCounter(field,maxleng){
var j=0;
var newStr = '';
for(var i =0;i <field.length;i ++){
if(field.substr(i,1).charCodeAt() > 255){
j += 2;
}else{
j ++;
}
if(j > maxleng){
newStr = field.substring(0,i);
break;
}else{
newStr = field;
}
}
return newStr;
}
</script>
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