window.document.onkeydown = OnKeyDown;
window.document.onkeypress = OnKeyPress;
var InputLanguage = 1; // 0: Lating, 1: Farsi.
var UserCanChangeInputLanguage = 0; // 0: No, 1: Yes.
var arFarsi =
[
	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, 0x0698, 0x0686, 0x00D7, 0x0640,
	0x067E, 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 OnKeyDown()
{
	if(UserCanChangeInputLanguage == 1)
	{
		if(window.event.shiftKey && window.event.ctrlKey)
		{
			InputLanguage = (InputLanguage == 0)? 1: 0;
			return(false);
		}
		else
		{
			if(window.event.shiftKey && window.event.altKey)
			{
				InputLanguage = (InputLanguage == 0)? 1: 0;
				return(false);
			}
			else
			{
				return(true);
			}
		}
	}
}

function OnKeyPress()
{
	var key;
	if(event.srcElement.name)
	{
		if(InputLanguage == 1)
		{
			key = window.event.keyCode;

			if(key < 0x0020 || key >= 0x00FF)
				return(true);

			var dtElement = 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) && (dtElement.value.lastIndexOf(String.fromCharCode(1740)) == dtElement.value.length - 1) && dtElement.value.length > 0)
			{
				dtElement.value  = dtElement.value.slice(0 ,-1);
				dtElement.value += String.fromCharCode(1610);
			}

			if(key == 0x0020 && window.event.shiftKey)
				window.event.keyCode = 0x200C;
			else
				window.event.keyCode = arFarsi[key - 0x0020];
			return(true);
		}
		else
		{
			key = window.event.keyCode;
			switch(key)
			{
				case 1570:{key = 72; break;}
				case 1574:{key = 109; break;}
				case 1575:{key = 104; break;}
				case 1576:{key = 102; break;}
				case 1662:{key = 126; break;}
				case 1578:{key = 106; break;}
				case 1579:{key = 101; break;}
				case 1580:{key = 123; break;}
				case 1670:{key = 125; break;}
				case 1581:{key = 112; break;}
				case 1582:{key = 111; break;}
				case 1583:{key = 110; break;}
				case 1584:{key = 98; break;}
				case 1585:{key = 118; break;}
				case 1586:{key = 99; break;}
				case 1688:{key = 124; break;}
				case 1587:{key = 115; break;}
				case 1588:{key = 97; break;}
				case 1589:{key = 119; break;}
				case 1590:{key = 113; break;}
				case 1591:{key = 120; break;}
				case 1592:{key = 122; break;}
				case 1593:{key = 117; break;}
				case 1594:{key = 121; break;}
				case 1601:{key = 116; break;}
				case 1602:{key = 114; break;}
				case 1705:{key = 58; break;}
				case 1711:{key = 34; break;}
				case 1604:{key = 103; break;}
				case 1605:{key = 108; break;}
				case 1606:{key = 107; break;}
				case 1608:{key = 60; break;}
				case 1607:{key = 105; break;}
				case 1740:{key = 100; break;}
			}
			window.event.keyCode = key;
			return(true);
		}
	}
}