function love1_check()
{
	if(document.forms[0].elements[0].value == "1:8")
	{
		alert("Correct");	
	}
	else
	{
		alert("Incorrect");
	}
}
function probability_check()
{
	if( document.forms[0].elements[0].value =="1:7" || document.forms[0].elements[0].value == "1/7" )
	{
		alert("Correct");
	}
	else
	{
		alert("Incorrect");
	}
	return false;
}

function probability2_check1()
{
	var str = document.forms[0].elements[0].value;
	if( str.length > 0 && str.indexOf(":") == -1 )
	{
		alert("Remember, you must put your answer in its simplest form separated by a colon.");
	}
	else
	{
		if(str == "1:3")
		{
			alert("Correct!");
		}
		else
		{
			alert("Incorrect.");
		} 
	}
	return false;
}

function probability2_check2()
{
	var str = document.forms[1].elements[0].value;
	if( str.length > 0 && str.indexOf(":") == -1 )
	{
		alert("Remember, you must put your answer in its simplest form separated by a colon.");
	}
	else
	{
		if( str == "1:4")
		{
			alert("Correct!");
		}
		else
		{
			alert("Incorrect.");
		}
	}
	return false;
}

function combinations_check()
{
	if(document.forms[0].elements[0].value == "12")
	{
		alert("Correct!");
	}
	else
	{
		alert("Incorrect.  Try Again.");
	}
	return false;
}

function slappy_check()
{
	if(document.forms[0].elements[0].value == "36")
	{
		alert("Correct!");
	}
	else
	{
		alert("Incorrect. Try Again.");
	}
	return false;
}

function chips_GrabChip()
{
	var str=GrabFromBag();
	if(document.forms[0].elements[0].value.indexOf(str) != -1)
	{
		repeats++;
		document.forms[0].elements[0].value = str + ", " + (repeats+1);
	}
	else
	{
		repeats = 0;
		document.forms[0].elements[0].value = str;
	}
}

function chips_check()
{
	if(document.forms[0].elements[2].value == "1")
	{	
		alert("Correct!");
	}
	else
	{
		alert("Incorrect. Make sure you do enough trials!");
	}
	return false;
}

function prob4_check()
{
	if(document.forms[0].elements[0].value == "6")
	{
		if( confirm("Correct.  Would you like to try another problem?") )
		{
			self.parent.top.location = "lotteryex2.html";
		}
	}
	else
	{
		alert("Incorrect.");
	}
	return false;
}

function lotteryex2_check1()
{
	var str = document.forms[0].elements[0].value;
	if(str.length > 0 && str.indexOf(":") == -1)
	{
		alert("Express your answers as a ratio in simplest form using a colon to separate the numbers, such as 3:4.");
	}
	else
	{
		if( str == "1:1000000" || str == "1:1,000,000")
		{
			alert("Correct!");
		}	
		else
		{
			alert("Incorrect.");
		}
	}
	return false;
}

function lotteryex2_check2()
{
	if(document.forms[1].elements[0].value == "5")
	{
		alert("Correct!");
	}
	else
	{
		alert("Incorrect.");
	}
	return false;
}

function lotteryex2_check3()
{
	var str = document.forms[2].elements[0].value;
	if(str.length > 0 && str.indexOf(":") == -1)
	{
		alert("Express your answers as a ratio in simplest form using a colon to separate the numbers, such as 3:4.");
	}
	else
	{
		if( str == "1:4" )
		{
			alert("Correct!");
		}	
		else
		{
			alert("Incorrect.");
		}
	}
	return false;
}

//global marlowe variables:

var marlowe1_errorMsg="";
var marlowe2_errorMsg="";
var marlowe3_errorMsg="";

function marlowe1_probability()
{	
	//should be implemented as a pop-up window rather than a dialog.
	alert("Probability is the number of favorable outcomes over the number of possible outcomes.  The probability of rolling a 'five' on a six sided die is 1:6 because there are six possible outcomes (sides with 1 to 6 dots) and one favorable outcome (the side with 5 dots).");
}

function marlowe1_BigCheck()
{
	if( marlowe1_check1() && marlowe1_check2() && marlowe1_check3 && marlowe1_check4() )
	{
		self.parent.top.location = "marlowe2.html";
	}
	else
	{
		alert( marlowe1_errorMsg );
	}
	marlowe1_errorMsg = "";
}

function marlowe1_check1()
{
	var str = document.forms[0].elements[0].value;
	if( str.length > 0 && str.indexOf(":") == -1 )
	{
		marlowe1_errorMsg += "Express probability as a ratio in simplified form. ";
		return false;
	}
	else
	{
		if( str == "1:6" )
		{
			return true;
		}
		else
		{
			marlowe1_errorMsg += "The probability in #1 isn't quite right. ";
			return false;
		}
	}
}

function marlowe1_check2()
{
	var str = document.forms[0].elements[1].value;
	if(str == "no" || str =="No" || str == "n" || str == "N" || str.indexOf("no") != -1 || str.indexOf("No") != -1 )
	{
		return true;
	}
	else
	{
		marlowe1_errorMsg += "Are you SURE Marlowe has a good chance of getting a guard who falls completely asleep? ";
		return false;
	}
}

function marlowe1_check3()
{
	var str = document.forms[0].elements[2].value;
	if( str.length > 0 && str.indexOf(":") == -1 && str.indexOf("Express probability as a ratio in simplified form. ") == -1 )
	{
		marlowe1_errorMsg += "Express probability as a ratio in simplified form. ";
		return false;
	}
	else
	{
		if( str == "1:2" )
		{
			return true;
		}
		else
		{
			marlowe1_errorMsg += "I'm not sure Marlowe has a " + str + " probability of getting a heavy or light sleeper. ";
			return false;
		}
	}
}

function marlowe1_check4()
{
	var str = document.forms[0].elements[1].value;
	if(str == "no" || str =="No" || str == "n" || str == "N" || str.indexOf("no") != -1 || str.indexOf("No") != -1 )
	{
		return true;
	}
	else
	{
		marlowe1_errorMsg += "So what if Marlowe waits around? Nobody said anything about the guards sleeping deeper as the night goes on. ";
		return false;
	}
}

function marlowe2_BigCheck()
{
	var allCorrect=true;
	
	if( !marlowe2_check1() )
	{
		allCorrect=false;
	}

	if( !marlowe2_check2() )
	{
		allCorrect=false;
	}

	if( !marlowe2_check3() )
	{
		allCorrect=false;
	}

	if(!marlowe2_check4() )
	{
		allCorrect=false;
	}

	if(allCorrect)
	{
		self.parent.top.location="marlowe2b.html";
	}
	else
	{
		alert(marlowe2_errorMsg);
	}
	marlowe2_errorMsg="";
}

function marlowe2_check1()
{
	if(eval(document.forms[0].elements[0].value) == 372)
	{
		return true;
	}
	else
	{
		marlowe2_errorMsg = "The first answer is not quite right.";
		return false;
	}
}

function marlowe2_check2()
{
	var str = document.forms[0].elements[1].value;
	if(str == "")
	{
		marlowe2_errorMsg += " You must answer the second question. ";
		return false;
	}	

	if( str.indexOf(":") == -1 && str.indexOf("Express probability as a ratio in simplified form. ") == -1 )
	{
		marlowe2_errorMsg += " Express probability as a ratio in simplified form. ";
		return false;
	}
	else
	{
		if( str == "1:372" )
		{
			return true;
		}
		else
		{
			marlowe2_errorMsg += " Are you sure that Marlowe has a " + str + " probability that she will guess the correct numbers? "; 
			return false;
		}
	}
}

function marlowe2_check3()
{
	var str = document.forms[0].elements[2].value;
	if(str == "")
	{
		str ="that";
	}
		
	if( str == "1:45" )
	{
		return true;
	}
	else
	{
		marlowe2_errorMsg+=" Nope, " + str + " is not correct for #3. "
		return false;
	}

}	

function marlowe2_check4()
{
	var str = document.forms[0].elements[3].value;
	if( str.length > 0 && str.indexOf(":") == -1 && marlowe2_errorMsg.indexOf("Express probability as a ratio in simplified form. ") != -1 )
	{
		marlowe2_errorMsg += "Express probability as a ratio in simplified form. ";
		return false;
	}
	else
	{
		if( str == "1:6" )
		{
			return true;
		}
		else
		{
			marlowe2_errorMsg += " The ratio in the last question doesn't represent the correct probability. ";
			return false;
		}
	}
}

function marlowe3_BigCheck()
{
	if( marlowe3_check1() && marlowe3_check2() )
	{
		self.parent.top.location = "marlowe4.html";
	}
	else
	{
		if( marlowe3_errorMsg.indexOf("is not") != -1 )
		{
			alert( marlowe3_errorMsg); 
		}
		else
		{
			alert(marlowe3_errorMsg);
		}
	}
	marlowe3_errorMsg ="";
}

function marlowe3_check1()
{
	var str = document.forms[0].elements[0].value;
	if( str.indexOf("%") == -1 )
	{
		marlowe3_errorMsg = "You must express your answer as a percent. ";
		return false;
	}
	else
	{
		if( str == "37.5%" )
		{
			return true;
		}
		else
		{
			marlowe3_errorMsg = str + " is not the correct experimental probability of Marlowe making it over the wall.";
			return false;
		}
	}
}

function marlowe3_check2()
{
	var str = document.forms[0].elements[1].value;
	if( str.indexOf("%") == -1 && marlowe3_errorMsg.indexOf("You must express your answer as a percent.") == -1)
	{
		marlowe3_errorMsg += "You must express your answer as a percent. ";
		return false;
	}
	else
	{
		if( str == "50%" )
		{
			return true;
		}
		else
		{
			marlowe3_errorMsg += str + " is not the correct theoretical probability of Marlowe making it over the wall.";
			return false;
		}
	}
}


function marlowe4_BigCheck()
{
	var errorMsg="";
	var correct=true;
	var tempStr=document.forms[0].elements[2].value;
	if(document.forms[0].elements[0].value != "50")
	{
		errorMsg += "Are you sure that's the surface area of the stones?";
		correct = false;
	}

	if(tempStr != "21")
	{
		if(tempStr.length < 1)
		{
			tempStr = "That";
		}
		
		errorMsg += " "+ tempStr + " is not the correct surface area of the bridge.";
		correct = false;
	}

	if( correct && document.forms[0].elements[1].checked != true )
	{
		errorMsg = "You have the correct surface areas, but you need to select the one with the most surface area.";
		alert(errorMsg);
	}
	else
	{
		if(correct)
		{
			self.parent.top.location = "marlowe5.html";
		}
		else
		{
			alert(errorMsg);
		}
	}
	return false;
}
/********************************************************************
	"Machine's" Code; no pages access the following
	functions directly.
*********************************************************************/
//global variable for the bag of chips machine
var repeats=0;

function Die(range)
{
	var tempVal;
	do
	{
		tempVal=Math.random()*10;
		tempVal=parseInt(tempVal);
	}
	while(!CheckVal(tempVal, range));
	return tempVal;
}

function CheckVal(num, range)
{
	var check=false;
	for(var i=0; i<=range; i++)
	{
		if(num == i)
		{
			check=true;
		}
	}
	return check;
}


function GrabFromBag()
{
	var num=Die(10);
	if(num > 0 && num <= 3)
	{
		return "red";
	}
	else
	{
		if(num > 3 && num <= 5)
		{
			return "blue";
		}
		else
		{
			if(num > 5 && num <= 6)
			{
				return "yellow";
			}
			else
			{
				return "green";
			}
		}
	}

}