<center>Enter weekly allowance &ensp;<input type="text" id="money"></input><br><br>

Enter money saved: &ensp;&ensp;&ensp;&nbsp;&nbsp; <input type="text" id="saved"></input><br><br>

Enter desired cost: &ensp;&ensp;&ensp;&ensp;&ensp;&nbsp;&nbsp;<input type="text" id="cost"></input><br><br>

<button onclick="moneycalc();">Submit</button></center>

function moneycalc(){

var allowance = document.getElementById("money").value;

var saved = document.getElementById("saved").value;

var cost = document.getElementById("cost").value;

var weeks = 0;

//Cast total subsidaries to Number to interpret as numb and not str

var total = Number(saved) + Number(allowance);

//Where the magic happens

if (total>=cost){alert("You already have enough!!!");}

if (!allowance){document.write("Error: Please enter an allowance<br>");}

if (!cost){document.write("Error: Please enter a cost<br>");}

//if (allowance>=cost){alert("You will have enough within the week");}

while (cost > total){weeks++;total = Number(allowance) + Number(total);}

alert("It will take about " + weeks + " weeks to earn " + total + " dollars");

}