function dd(list){
var listElementStyle=document.getElementById(list).style;
if (listElementStyle.display=="none"){
listElementStyle.display="block";}
else {
listElementStyle.display="none";
}
}

// Percent Calculator
function get_percent(thebutton) {
	var theform = thebutton.form;
	var percent = theform.percent.value;
	var number = theform.number.value;
	var percent2 = theform.percent2.value;
	var number2 = theform.number2.value;
	
	// if all fields are left blank
	if (percent == "" & number == "" & percent2 == "" & number2 == "") {
		alert ('Please input two values.');
	
	// if one field is left blank
	} else if (percent == "" & number != "" && percent2 == "" & number2 == "") {
		alert ('Make sure both fields are filled out.');	
	} else if (percent != "" & number == "" && percent2 == "" & number2 == "") {
		alert ('Make sure both fields are filled out.');	
	} else if (percent == "" & number == "" && percent2 == "" & number2 != "") {
		alert ('Make sure both fields are filled out.');
	} else if (percent == "" & number == "" && percent2 != "" & number2 == "") {
		alert ('Make sure both fields are filled out.');
		
	// in case one value is inserted in the calculation not being computed (will give answer to whichever is filled in properly)		  
	} else if (percent != "" & number != "" && percent2 != "" & number2 == "") {
		document.getElementById('percentage').innerHTML = percent + '% of ' + number + ' = <span class=\'answer\'>' + ((number * (percent / 100)).toFixed(2)) + '</span>';
	} else if (percent != "" & number != "" && percent2 == "" & number2 != "") {
		document.getElementById('percentage').innerHTML = percent + '% of ' + number + ' = <span class=\'answer\'>' + ((number * (percent / 100)).toFixed(2)) + '</span>';
	} else if (percent != "" & number == "" && percent2 != "" & number2 != "") {
		document.getElementById('percentage').innerHTML = percent2 + ' is <span class=\'answer\'>' + (((100 * (percent2 / number2))).toFixed(2)) + '%</span> of ' + number2;
	} else if (percent == "" & number != "" && percent2 != "" & number2 != "") {
		document.getElementById('percentage').innerHTML = percent2 + ' is <span class=\'answer\'>' + (((100 * (percent2 / number2))).toFixed(2)) + '%</span> of ' + number2;
	
	// calculate percentage	  	  	
	} else if (percent != "" & number != "" && percent2 == "" & number2 == "") {
		document.getElementById('percentage').innerHTML = percent + '% of ' + number + ' = <span class=\'answer\'>' + ((number * (percent / 100)).toFixed(2)) + '</span>';
	} else if (percent == "" & number == "" && percent2 != "" & number2 != "") {
		document.getElementById('percentage').innerHTML = percent2 + ' is <span class=\'answer\'>' + (((100 * (percent2 / number2))).toFixed(2)) + '%</span> of ' + number2;
	
	// if all input boxes are filled in
	} else if (percent != "" & number != "" && percent2 != "" & number2 != "") { 
		alert ('Please do one calculation at a time!');
	}
	
	// clear form after calculation
	document.getElementById('percent').value = "";
	document.getElementById('percent2').value = "";
	document.getElementById('number').value = "";
	document.getElementById('number2').value = "";
	return false;
}
// End Percent Calculator