This is my code. I am attempting to get values from the drop down menu and text, put them into the equation. What am I doing wrong so that the function is stopping half way through. I know it is probably really easy to solve but I cannot find a solution anywhere. Please help.
<!doctype html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<h3> Question 6 </h3>
<h4> How long can you safely tan for? </h4>
<script language="javascript">
function calculate5() {
var skin = document.getElementById("skinselect");
var skinselect = Math.floor(skinselect.options[skinselect.selectedIndex].value);
var cloud = document.getElementById("cloudselect");
var cloudselect = Math.floor(cloudselect.options[cloudselect.selectedIndex].value);
var temp = Math.floor(document.getElementById("temp").value);
var time = ((skinselect + cloudselect) * temp) - 50;
alert("Your safe sunbaking time is " + time + " minutes");
}
</script>
<select id="skinselect">
<option value="error">Skin type: 0 is light, 5 is dark </option>
<option value="0"> 0 </option>
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
</select>
<select id="cloudselect">
<option value="error">Cloud Cover: 0 is clear, 5 is overcast </option>
<option value="0"> 0 </option>
<option value="1"> 1 </option>
<option value="2"> 2 </option>
<option value="3"> 3 </option>
<option value="4"> 4 </option>
<option value="5"> 5 </option>
</select>
<input type="text" value="Temperature (C)" id="temp" size="16">
<input type="button" value="Calculate" onClick="calculate5()">
</body>
</html>
