var KeylangFarsi=true;
// for keypress
function farsikey(myfield,e)
{
var key;
var basestring=' !"#$%،گ)(×+و-./0123456789:ک,=.؟@ِذ}ىُىلآ÷ـ،/’د×؛َءٍف‘{ًْإ~جژچ^_پشذزیثبلاهتنمئدخحضقسفعرصطغظ<|>ّ';
if (window.event)
key = window.event.keyCode;
else if (e)
key = e.which;

if (key < 0x0020 || key >= 0x00FF) return true;
if (KeylangFarsi==true)
{
if (window.event)
window.event.keyCode=basestring.charCodeAt(key-32);
else if (e)
e.which=basestring.charCodeAt(key-32);
}
return true;
}

// function for keydown
function changelang(objtext1)
{
if (window.event.keyCode==119)
KeylangFarsi =(KeylangFarsi==true) ? false : true ;
if (window.event.altKey && window.event.shiftKey )
KeylangFarsi = false ;
return true;
}