Java Script Addition Problem

I am a newbie in javascript. I have some issue in simple addition program. I was making a simple program to add numbers. the first part is hat it prompts asking that how may do you want to add. This one is fine. But in the second part. When I put the numbers like 3 + 3 + 3. It gives the result 333 instead of 9. How can I correct this. Second problem. I was trying to add two numbers in a window froma a text box inside a frame. The issue is that as they are strings so whenever i use a plus sign they build strings. The below is an example of what I am doing.
value1=window.parent.SelectSquad.myballroom1_value.value;
value2=window.parent.SelectSquad.myballroom2_value.value;
total=value1 + value2;
window.parent.SelectSquad.spent.value=total;

Now how to work out with this issues.

Javascript is a very easy in handling stings and numbers. You correct your addition problem you can do two things. First take care that the addition is handled as numbers or the input values are handled as numbers. I am giving solution for your first problem i.e the addition one. I will go with the first option because it is easy. But putting the multiplication sign Java treat it as numbers. Follow the below codec's

PHP Code:

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var num1 = prompt("Which number would you like to add? ","");
num1 = num1 * 1;
sum += num1; 


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For the last problem you mentioned I had some solution for that. Look into my suggestion below and make some correction. The correction will give you a better result as compare to before. You will now need to look at the parseInt.

Code:

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total=parseInt(value1) + parseInt(value2);

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There is a different function in Javascript for the same problem It is called parseFloat function.

I am listing a piece of codec sample created on your query for your problem. Just copy paste or better refer it. Then you will came to know where is the problem. Try the below codec's.

PHP Code:

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function dispSpent() {
var currForm = window.parent.SelectSquad;
value1 = currForm.myballroom1_value.value;
value2 = currForm.myballroom2_value.value;
if (isNaN(value1) || parseInt(value1) != value1) {
alert('Please enter an integer (whole number).');currForm.goalkeeper1_value.focus();currForm.myballroom1_value.select();return false;
}
if (isNaN(value2) || parseInt(value2) != value2) {
alert('Please enter an integer (whole number).');currForm.myballroom2_value.focus();currForm.myballroom2_value.select();return false;
}
total = eval(value1) + eval(value2);
currForm.spent.value = total;
} 


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Best of luck.