//introduction
var lfar = true;

  var langFarsi
	var farsikey = [    
	0x0020, 0x0021, 0x061B, 0x066B, 0x00A4, 0x066A, 0x060C, 0x06AF,      
	0x0029, 0x0028, 0x002A, 0x002B, 0x0648, 0x002D, 0x002E, 0x002F,      
	0x06F0, 0x06F1, 0x06F2, 0x06F3, 0x06F4, 0x06F5, 0x06F6, 0x06F7,      
	0x06F8, 0x06F9, 0x003A, 0x06A9, 0x003E, 0x003D, 0x003C, 0x061F,      
	0x066C, 0x0624, 0x200C, 0x0698, 0x064A, 0x064D, 0x0625, 0x0623,      
	0x0622, 0x0651, 0x0629, 0x00BB, 0x00AB, 0x0621, 0x004E, 0x005D,      
	0x005B, 0x0652, 0x064B, 0x0626, 0x064F, 0x064E, 0x0056, 0x064C,            
	0x0058, 0x0650, 0x0643, 0x062C, 0x067E, 0x0686, 0x00D7, 0x0640,            
	0x00F7, 0x0634, 0x0630, 0x0632, 0x06CC, 0x062B, 0x0628, 0x0644,            
	0x0627, 0x0647, 0x062A, 0x0646, 0x0645, 0x0626, 0x062F, 0x062E,            
	0x062D, 0x0636, 0x0642, 0x0633, 0x0641, 0x0639, 0x0631, 0x0635,            
	0x0637, 0x063A, 0x0638, 0x007D, 0x007C, 0x007B, 0x007E            
	];   

function ChangeLanguage(bol) {
        if (bol==''){

          if(lfar){lfar=false}else{lfar=true};

        }else{

	lfar=bol;

        }
        return true;
}     

function FKeyDown() {

	if (window.event.shiftKey && window.event.altKey) {
		ChangeLanguage();
		return false;
	}
	return true;
}

function FKeyPress() {
   langFarsi = lfar;      
   var key = window.event.keyCode;
   if ((langFarsi)&(key==86)) {key=65}
   if ((langFarsi)&(key==88)) {key=68}
   if (key < 0x0020 || key >= 0x00FF)
      return;
   if (langFarsi) {
      var el = event.srcElement;
      var objRegExp = new RegExp("[A-Za-z\x27\x2C\x3B\x5B\x5C\x5D\x7C]");
      var validate_key = objRegExp.test(String.fromCharCode(key));
      if ((validate_key || (key==92)) && (key != 0x200C) && (el.value.lastIndexOf(String.fromCharCode(1740)) == el.value.length - 1) && el.value.length > 0) {
         el.value = el.value.slice(0, -1);
         el.value += String.fromCharCode(1610);
      }
      if (key == 0x0020 && window.event.shiftKey) {
         window.event.keyCode = 0x200C;
      }else{
         window.event.keyCode = farsikey[key - 0x0020];
         }
   }
   return true;
}
 function chln(){
  if (window.event.shiftKey && window.event.altKey) {
  ChangeLanguage();
  };
  }
  function chgl(){
  FKeyPress();
  }