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(thename, theid, thelimit){

var theform=theid!=""? document.getElementById(theid) : thename

var limit_text='<b><span id="'+theform.toString()+'">'+thelimit+'</span></b> characters remaining'

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)}

eval(theform).onfocus=function(){ countlimit(thelimit,event,theform)}

document.body.onload=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); 

document.body.addEventListener('focus', function(event) { countlimit(thelimit,event,theform) }, true); 

document.body.addEventListener('load', function(event) { countlimit(thelimit,event,theform) }, true); 

}

}