var Result=0, Operator=0, Second=0, Ready=0, Done=1, Complete=0, Integer, CurrentValue;

function reset(value)
{
	document.calculator.LED.value = value;
	Result = 0, Operator = 0, Second = 0, Ready = 0; Done = 1; Complete = 0;
}

function SetValue(NewValue)
{
	Integer = 1;
	if(Second || Done) {
		Second = 0;
		Done = 0;
		CurrentValue = NewValue;
	}

	for(var i=0; i<CurrentValue.length; i++)
		if (CurrentValue[i]=='.')
			Integer=0;
}

function Click(Caption)
{
	CurrentValue = document.calculator.LED.value;

	if(Caption=='.') {
		SetValue('0');
		if(Integer) {
			CurrentValue += Caption;
			document.calculator.LED.value = CurrentValue;
			Complete = 0;
		}
	}

	if (Caption.length == 1 && Caption>='0' && Caption<='9') {
		SetValue('');
		if(CurrentValue=='0')
			CurrentValue='';

		CurrentValue += Caption;
		document.calculator.LED.value = CurrentValue;
		Complete = 1;
	}

	if (Caption=='pi') {
		CurrentValue = Math.PI;
		document.calculator.LED.value = CurrentValue;
		Complete = 1;
	}

	if (Caption=='e') {
		CurrentValue = Math.E;
		document.calculator.LED.value = CurrentValue;
		Complete = 1;
	}

	if(Caption=='-' || Caption=='+' || Caption=='/' || Caption=='*' || Caption=='^') {
		if(Second)
			Operator = Caption
		else {
			if(!Ready) {
				Operator = Caption;
				Result = CurrentValue;
				Ready=1;
			} else {
				if (Operator=='^')
					Result = Math.pow(Result, CurrentValue);
				else
					Result = eval(Result + Operator + CurrentValue);

				Operator = Caption; document.calculator.LED.value = Result;

			} 
			Complete=0; Second = 1;
		}
	}

	if(Caption=='1/x' ) {
		Result = eval('1/' + CurrentValue) ; reset(Result);
	}

	if(Caption=='sqrt') {
		Result = Math.sqrt(CurrentValue);
		reset(Result);
	}

	if(Caption=='exp' ) {
		Result = Math.exp(CurrentValue);
		reset(Result);
	}

	if(Caption=='log' ) {
		Result = Math.log(CurrentValue) / Math.LN10;
		reset(Result);
	}

	if(Caption=='ln' ) {
		Result = Math.log(CurrentValue);
		reset(Result);
	}

	if(Caption=='sin' ) {
		Result = CurrentValue;

		if (document.calculator.angle[0].checked)
			Result = Result * Math.PI / 180;

		if (document.calculator.angle[2].checked)
			Result = Result * Math.PI / 200;

		Result = Math.sin(Result);
		reset(Result);
	}

	if(Caption=='cos' ) {
		Result = CurrentValue;

		if (document.calculator.angle[0].checked)
			Result = Result * Math.PI / 180;

		if (document.calculator.angle[2].checked)
			Result = Result * Math.PI / 200;

		Result = Math.cos(Result);
		reset(Result);
	}

	if(Caption=='tan' ) {
		Result = CurrentValue;

		if (document.calculator.angle[0].checked)
			Result = Result * Math.PI / 180;

		if (document.calculator.angle[2].checked)
			Result = Result * Math.PI / 200;

		Result = Math.tan(Result);
		reset(Result);
	}

	if(Caption=='asin' ) {
		Result = Math.asin(CurrentValue);

		if (document.calculator.angle[0].checked)
			Result = Result * 180 / Math.PI;

		if (document.calculator.angle[2].checked)
			Result = Result * 200 / Math.PI;

		reset(Result);
	}

	if(Caption=='acos' ) {
		Result = Math.acos(CurrentValue);

		if (document.calculator.angle[0].checked)
			Result = Result * 180 / Math.PI;

		if (document.calculator.angle[2].checked)
			Result = Result * 200 / Math.PI;

		reset(Result);
	}

	if(Caption=='atan' ) {
		Result = Math.atan(CurrentValue);

		if (document.calculator.angle[0].checked)
			Result = Result * 180 / Math.PI;

		if (document.calculator.angle[2].checked)
			Result = Result * 200 / Math.PI;

		reset(Result);
	}

	if(Caption=='sinh' ) {
		Result = Math.exp(CurrentValue);
		Result = (Result - 1 / Result) / 2;
		reset(Result);
	}

	if(Caption=='cosh' ) {
		Result = Math.exp(CurrentValue);
		Result = (Result + 1 / Result) / 2;
		reset(Result);
	}

	if(Caption=='tanh' ) {
		Result = Math.exp(CurrentValue);
		Result = (Result - 1 / Result) / (Result + 1 / Result);
		reset(Result);
	}

	if(Caption=='asinh' ) {
		Result = CurrentValue / Math.abs(CurrentValue) * Math.log(Math.abs(CurrentValue) + Math.sqrt(CurrentValue * CurrentValue + 1));
		reset(Result);
	}

	if(Caption=='acosh' ) {
		Result = 2 * Math.log(Math.sqrt((CurrentValue + 1) / 2) + Math.sqrt((CurrentValue - 1) / 2));
		reset(Result);
	}

	if(Caption=='atanh' ) {
		Result = Math.log((CurrentValue - 1) / (CurrentValue + 1)) / 2;
		reset(Result);
	}

	if(Caption=='+/-')
		document.calculator.LED.value = eval(-CurrentValue);

	if(Caption=='=' && Complete && Operator!='0') {
		if (Operator=='^') {
			Result = Math.pow(Result, CurrentValue);
			reset(Result);
		} else
			reset(eval(Result + Operator + CurrentValue));
	}

	if (Caption=='C')
		reset(0);

	if(document.calculator.LED.value[0] == '.')
		document.calculator.LED.value = '0' + document.calculator.LED.value;
}