var lang = 1;   // 1: Farsi, 0: English 

var keys = new Array(1711,0,0,0,0,1608,0,0,0,0,0,0,0,0,0,0 
,0,0,0,0, 
1603,1572,0,1548,1567,0,1616, 
1571,8250,0,1615,0,0,1570, 
1577,0,0,0,1569,1573,0,0,1614,1612,1613,0,0,8249,1611, 
171,0,187,1580,1688,1670,0,1600, 
1662,1588,1584,1586,1610,1579,1576, 
1604,1575,1607,1578,1606,1605,1574, 
1583,1582,1581,1590,1602,1587,1601,1593,1585,1589,1591,1594,1592); 


function FKeyDown (){ 
 var key = window.event.keyCode; 
 if (key == 145){ 
    if (lang == 0) 
    { 
      lang = 1; 
      return true; 
    } 
    else 
    { 
      lang = 0; 
      return true; 
    } 
   } 
} 

function keyConv(){ 
  
      if (lang == 1) 
      { 
   if((event.keyCode > 38) && (event.keyCode < 123)){ 
      event.keyCode = (keys[event.keyCode - 39])? (keys[event.keyCode - 39]): event.keyCode; 
   } 
      } 
} 


function strvalidate_fa(str){ 
   var i, chr; 
   for(i = 0 ; i < str.length ; i++){ 
      chr = str.charCodeAt(i); 
      if(!((chr == 32) || (chr >= 1569 && chr <= 1594) || (chr >= 1601 && chr <= 1610) || (chr == 1662) || (chr == 1670) || (chr == 1688) || (chr == 1711))) return false; 
   } 
   return true; 
}