// JavaScript Document
///// script per la limitazione dei caratteri////////
    var ns6=document.getElementById&&!document.all

    function restrictinput(maxlength,e,placeholder){
        if (window.event&&event.srcElement.value.length>=maxlength)
            return false
        else if (e.target&&e.target==eval(placeholder)&&e.target.value.length>=maxlength){
            var pressedkey=/[a-zA-Z0-9\,\/]/ //detect alphanumeric keys
            if (pressedkey.test(String.fromCharCode(e.which)))
                e.stopPropagation()
        }
    }
    
    function countlimit(maxlength,e,placeholder){
        var theform=eval(placeholder)
        var lengthleft=maxlength-theform.value.length
        var placeholderobj=document.all? document.all[placeholder] : document.getElementById(placeholder)
        if (window.event||e.target&&e.target==eval(placeholder)){
            if (lengthleft<0)
                theform.value=theform.value.substring(0,maxlength)
                 placeholderobj.innerHTML=lengthleft
        }
    }

    function displaylimit(theform,thelimit){
        var limit_text='<b><span id="'+theform.toString()+'">'+thelimit+'</span></b>'
        if (document.all||ns6)
            document.write(limit_text)
            if (document.all){
                eval(theform).onkeypress=function(){ return restrictinput(thelimit,event,theform)}
                eval(theform).onkeyup=function(){ countlimit(thelimit,event,theform)}
            }
        else if (ns6){
            document.body.addEventListener('keypress', function(event) { restrictinput(thelimit,event,theform) }, true); 
            document.body.addEventListener('keyup', function(event) { countlimit(thelimit,event,theform) }, true); 
        } 
    }